Alright, let's work through 3812 times 1290 step by step
3812 × 1290 = 1290 × (3812)
+ 1290 × 2 that results in 2580
+ 1290 × 10 yielding 12900
+ 1290 × 800 giving us 1032000
+ 1290 × 3000 which equals 3870000

= 4917480
