Alright, let's work through 1786 times 7778 step by step
1786 × 7778 = 7778 × (1786)
+ 7778 × 6 giving us 46668
+ 7778 × 80 what gives us 622240
+ 7778 × 700 producing 5444600
+ 7778 × 1000 that is equal 7778000

= 13891508
