Alright, let's work through 8639 times 5100 step by step
8639 × 5100 = 5100 × (8639)
+ 5100 × 9 which equals 45900
+ 5100 × 30 resulting in 153000
+ 5100 × 600 that is equal 3060000
+ 5100 × 8000 giving us 40800000

= 44058900
