Alright, let's work through 7723 times 1015 step by step
7723 × 1015 = 1015 × (7723)
+ 1015 × 3 giving us 3045
+ 1015 × 20 which equals 20300
+ 1015 × 700 giving us 710500
+ 1015 × 7000 that results in 7105000

= 7838845
