Alright, let's work through 3909 times 8740 step by step
3909 × 8740 = 8740 × (3909)
+ 8740 × 9 that equals 78660
+ 8740 × 00 which equals 0
+ 8740 × 900 that is equal 7866000
+ 8740 × 3000 that is equal 26220000

= 34164660
