Alright, let's work through 4811 times 4003 step by step
4811 × 4003 = 4003 × (4811)
+ 4003 × 1 resulting in 4003
+ 4003 × 10 that is equal 40030
+ 4003 × 800 yielding 3202400
+ 4003 × 4000 that equals 16012000

= 19258433
