Alright, let's work through 3720 times 4122 step by step
3720 × 4122 = 4122 × (3720)
+ 4122 × 0 which equals 0
+ 4122 × 20 what gives us 82440
+ 4122 × 700 resulting in 2885400
+ 4122 × 3000 what gives us 12366000

= 15333840
