Alright, let's work through 3814 times 1045 step by step
3814 × 1045 = 1045 × (3814)
+ 1045 × 4 which equals 4180
+ 1045 × 10 that is equal 10450
+ 1045 × 800 which equals 836000
+ 1045 × 3000 that equals 3135000

= 3985630
