Alright, let's work through 2487 times 4120 step by step
2487 × 4120 = 4120 × (2487)
+ 4120 × 7 which equals 28840
+ 4120 × 80 yielding 329600
+ 4120 × 400 which equals 1648000
+ 4120 × 2000 yielding 8240000

= 10246440
