Alright, let's work through 3651 times 4000 step by step
3651 × 4000 = 4000 × (3651)
+ 4000 × 1 resulting in 4000
+ 4000 × 50 that results in 200000
+ 4000 × 600 yielding 2400000
+ 4000 × 3000 that results in 12000000

= 14604000
