Alright, let's work through 7862 times 158 step by step
7862 × 158 = 158 × (7862)
+ 158 × 2 yielding 316
+ 158 × 60 which equals 9480
+ 158 × 800 that is equal 126400
+ 158 × 7000 which equals 1106000

= 1242196
