Alright, let's work through 4284 times 7157 step by step
4284 × 7157 = 7157 × (4284)
+ 7157 × 4 that equals 28628
+ 7157 × 80 that is equal 572560
+ 7157 × 200 producing 1431400
+ 7157 × 4000 resulting in 28628000

= 30660588
