Alright, let's work through 1503 times 8131 step by step
1503 × 8131 = 8131 × (1503)
+ 8131 × 3 that equals 24393
+ 8131 × 00 resulting in 0
+ 8131 × 500 what gives us 4065500
+ 8131 × 1000 yielding 8131000

= 12220893
