Alright, let's work through 5287 times 3531 step by step
5287 × 3531 = 3531 × (5287)
+ 3531 × 7 yielding 24717
+ 3531 × 80 that is equal 282480
+ 3531 × 200 resulting in 706200
+ 3531 × 5000 that results in 17655000

= 18668397
