Alright, let's work through 5457 times 8728 step by step
5457 × 8728 = 8728 × (5457)
+ 8728 × 7 which equals 61096
+ 8728 × 50 resulting in 436400
+ 8728 × 400 yielding 3491200
+ 8728 × 5000 which equals 43640000

= 47628696
