Alright, let's work through 9004 times 1428 step by step
9004 × 1428 = 1428 × (9004)
+ 1428 × 4 what gives us 5712
+ 1428 × 00 what gives us 0
+ 1428 × 000 what gives us 0
+ 1428 × 9000 which equals 12852000

= 12857712
