From the Achives: Muhammad Ali Showing Off his Wealth

Muhammad Ali With His Winnings in 74' 

I'm not sure how much he won in 1974 total, but that was the year of the "Rumble in the Jungle", which earned him $5 million alone.

The source, however, is a cover story in a 1964 Sports Illustrated called "My $1,000,000 Getaway," so this is probably all staged.