Alright, let's work through 8428 times 9229 step by step
8428 × 9229 = 9229 × (8428)
+ 9229 × 8 what gives us 73832
+ 9229 × 20 resulting in 184580
+ 9229 × 400 that equals 3691600
+ 9229 × 8000 that results in 73832000

= 77782012
