Alright, let's work through 1523 times 783 step by step
1523 × 783 = 783 × (1523)
+ 783 × 3 resulting in 2349
+ 783 × 20 that is equal 15660
+ 783 × 500 what gives us 391500
+ 783 × 1000 giving us 783000

= 1192509
