Alright, let's work through 7231 times 3902 step by step
7231 × 3902 = 3902 × (7231)
+ 3902 × 1 what gives us 3902
+ 3902 × 30 yielding 117060
+ 3902 × 200 yielding 780400
+ 3902 × 7000 producing 27314000

= 28215362
