Alright, let's work through 1786 times 347 step by step
1786 × 347 = 347 × (1786)
+ 347 × 6 what gives us 2082
+ 347 × 80 producing 27760
+ 347 × 700 which equals 242900
+ 347 × 1000 resulting in 347000

= 619742
