Alright, let's work through 8129 times 5403 step by step
8129 × 5403 = 5403 × (8129)
+ 5403 × 9 resulting in 48627
+ 5403 × 20 producing 108060
+ 5403 × 100 yielding 540300
+ 5403 × 8000 producing 43224000

= 43920987
