Alright, let's work through 1720 times 6814 step by step
1720 × 6814 = 6814 × (1720)
+ 6814 × 0 that is equal 0
+ 6814 × 20 resulting in 136280
+ 6814 × 700 yielding 4769800
+ 6814 × 1000 yielding 6814000

= 11720080
