78779 ÷ 5 = 15755 R4
Let's divide 78779 by 5.

Step 1:
5 goes into 7 1 times with a remainder of 2.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 5 from 7 to get 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 5

Step 2:
5 goes into 28 5 times with a remainder of 3.
Write down 5 as next digit of of the result. 
Result so far: 15
Subtract 25 from 28 to get 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 5

Step 3:
5 goes into 37 7 times with a remainder of 2.
Write down 7 as next digit of of the result. 
Result so far: 157
Subtract 35 from 37 to get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 5

Step 4:
5 goes into 27 5 times with a remainder of 2.
Write down 5 as next digit of of the result. 
Result so far: 1575
Subtract 25 from 27 to get 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 5

Step 5:
5 goes into 29 5 times with a remainder of 4.
Write down 5 as next digit of of the result. 
Result so far: 15755
Subtract 25 from 29 to get 4.

The final result is 15755 with a remainder of 4.