Alright, let's work through 3520 times 4931 step by step
3520 × 4931 = 4931 × (3520)
+ 4931 × 0 that results in 0
+ 4931 × 20 that is equal 98620
+ 4931 × 500 that results in 2465500
+ 4931 × 3000 that is equal 14793000

= 17357120
