Alright, let's work through 4087 times 4395 step by step
4087 × 4395 = 4395 × (4087)
+ 4395 × 7 producing 30765
+ 4395 × 80 resulting in 351600
+ 4395 × 000 giving us 0
+ 4395 × 4000 producing 17580000

= 17962365
