Alright, let's work through 3720 times 5222 step by step
3720 × 5222 = 5222 × (3720)
+ 5222 × 0 which equals 0
+ 5222 × 20 giving us 104440
+ 5222 × 700 that is equal 3655400
+ 5222 × 3000 that equals 15666000

= 19425840
