We're dividing 77831521 by 717 
Our goal is to divide 77831521 by 717.

Step 1:
When dividing 7 by 717, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 717

On to step 2:
717 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Grab the next digit (8) from the dividend, add it to 77, then carry on: 778 / 717

Advancing to step 3:
717 can be fit into 778 1 times, resulting in a remainder of 61.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 717 from 778 leaves us with 61.
Include the next digit (3) from the dividend after 61, then repeat: 613 / 717

Step 4:
If we divide 613 by 717, we get 0 and a remainder of 613.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 613 and we're left with 613.
Grab the next digit (1) from the dividend, add it to 613, then carry on: 6131 / 717

Step 5:
717 goes into 6131 8 times with a remainder of 395.
The number 8 becomes the next digit in our result. 
Result so far: 108.0
Subtracting 5736 from 6131 leaves us with 395.
Take the next digit (5) from the dividend and append it to 395, then repeat: 3955 / 717

Moving on to step 6:
The number 717 fits into 3955 5 times, leaving a remainder of 370.
The number 5 becomes the next digit in our result. 
Result so far: 1085.0
If we subtract 3585 from 3955, we get 370.
Grab the next digit (2) from the dividend, add it to 370, then carry on: 3702 / 717

Step 7:
When dividing 3702 by 717, we get 5 with a remainder of 117.
The number 5 becomes the next digit in our result. 
Result so far: 10855.0
Subtract 3585 from 3702 to get 117.
Bring next digit (1) of the dividend behind the 117 and repeat the process: 1171 / 717

Let's proceed to step 8:
717 can be fit into 1171 1 times, resulting in a remainder of 454.
Write down 1 as next digit of the result. 
Result so far: 108551.0
Subtracting 717 from 1171 leaves us with 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Going ahead to step 9:
717 goes into 4540 6 times with a remainder of 238.
Write down 6 as next digit of the result. 
Result so far: 108551.6
Deduct 4302 from 4540 and we're left with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Step 10:
When dividing 2380 by 717, we get 3 with a remainder of 229.
Write down 3 as next digit of the result. 
Result so far: 108551.63
Deduct 2151 from 2380 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

On to step 11:
717 goes into 2290 3 times with a remainder of 139.
Record the quotient 3 as the next digit in the result. 
Result so far: 108551.633
Subtract 2151 from 2290 to get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

After the division, we end up with 108551.633 and a remainder of 0.0139.