Alright, let's work through 4089 times 3822 step by step
4089 × 3822 = 3822 × (4089)
+ 3822 × 9 that results in 34398
+ 3822 × 80 yielding 305760
+ 3822 × 000 giving us 0
+ 3822 × 4000 that results in 15288000

= 15628158
