Alright, let's work through 1726 times 7780 step by step
1726 × 7780 = 7780 × (1726)
+ 7780 × 6 that equals 46680
+ 7780 × 20 which equals 155600
+ 7780 × 700 that is equal 5446000
+ 7780 × 1000 that results in 7780000

= 13428280
