Alright, let's work through 4831 times 5203 step by step
4831 × 5203 = 5203 × (4831)
+ 5203 × 1 producing 5203
+ 5203 × 30 that is equal 156090
+ 5203 × 800 that equals 4162400
+ 5203 × 4000 giving us 20812000

= 25135693
