Alright, let's work through 1803 times 4023 step by step
1803 × 4023 = 4023 × (1803)
+ 4023 × 3 resulting in 12069
+ 4023 × 00 yielding 0
+ 4023 × 800 resulting in 3218400
+ 4023 × 1000 resulting in 4023000

= 7253469
