Alright, let's work through 3117 times 103 step by step
3117 × 103 = 103 × (3117)
+ 103 × 7 that results in 721
+ 103 × 10 which equals 1030
+ 103 × 100 that equals 10300
+ 103 × 3000 yielding 309000

= 321051
