The progress we are making against our priorities is creating a more growth-oriented portfolio. At our Analyst Day, I said that we expect our 5 key growth areas to grow double digits and generate over $10 billion in revenue in fiscal '22. These businesses collectively grew 12% this quarter. This includes more than 30% growth for our Instant Ink business, as well as more than 20% growth for our industrial graphics portfolio. We see our key growth areas becoming a bigger part of overall revenue and profit mix moving forward. We are driving this growth even as we continue to navigate a complex and dynamic operational environment that includes robust demand and persistent supply constraints. The actions we have been taking to mitigate industry-wide headwinds are paying off. There is no quick fix, but we are strengthening our operational execution and making continued progress quarter-by-quarter.
PC sales drove HP's results. Personal systems revenue in the fourth quarter was $11.8 billion, up 13%. Consumer PC sales fell 3% in the quarter, and commercial revenue surged 25%. Total units fell 9% in the fourth quarter. Lores added:
A big part of our success is improved mix, we are driving given our leadership in the commercial PC market. And as more offices reopened, we led a shift toward Windows-based commercial products where we saw the strongest demand and highest profitability. We continue to see significantly elevated order backlog. As I shared last month, we expect component shortages to persist in at least the first half of '22.
For the printing business, HP delivered revenue of $4.9 billion, up 1% from a year ago. Both consumer and commercial units fell double digits.
As for the outlook, HP projected first quarter non-GAAP earnings of 99 cents a share to $1.05 a share. Wall Street was looking for first quarter non-GAAP earnings of 94 cents a share. For fiscal 2022, HP projected non-GAAP earnings between $4.07 a share and $4.27 a share. HP is projecting fiscal 2022 cash flow of at least $4.5 billion.