We divide 15691257 by 686
Our goal is to divide 15691257 by 686.

On to step 1:
The number 686 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 686

Moving on to step 2:
If we divide 15 by 686, we get 0 and a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 686

Advancing to step 3:
The number 686 fits into 156 0 times, leaving a remainder of 156.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 156 leaves us with 156.
Take the next digit (9) from the dividend and append it to 156, then repeat: 1569 / 686

Advancing to step 4:
When dividing 1569 by 686, we get 2 with a remainder of 197.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 197 after subtracting 1372 from 1569.
Append the next digit (1) from the dividend to 197 and continue with: 1971 / 686

Let's proceed to step 5:
If we divide 1971 by 686, we get 2 and a remainder of 599.
Put 2 as the next digit of the answer. 
Result so far: 22.0
The remainder is 599 after subtracting 1372 from 1971.
Take the next digit (2) from the dividend and append it to 599, then repeat: 5992 / 686

Step 6:
When dividing 5992 by 686, we get 8 with a remainder of 504.
Use 8 as the next digit of our solution. 
Result so far: 228.0
If we take 5488 away from 5992, we end up with 504.
Append the next digit (5) from the dividend to 504 and continue with: 5045 / 686

Let's proceed to step 7:
When dividing 5045 by 686, we get 7 with a remainder of 243.
Put 7 as the next digit of the answer. 
Result so far: 2287.0
If we subtract 4802 from 5045, we get 243.
Include the next digit (7) from the dividend after 243, then repeat: 2437 / 686

On to step 8:
686 can be fit into 2437 3 times, resulting in a remainder of 379.
The next digit of our result is 3. 
Result so far: 22873.0
Subtracting 2058 from 2437 leaves us with 379.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

Step 9:
The number 686 fits into 3790 5 times, leaving a remainder of 360.
The number 5 becomes the next digit in our result. 
Result so far: 22873.5
Deduct 3430 from 3790 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 10:
686 can be fit into 3600 5 times, resulting in a remainder of 170.
The number 5 becomes the next digit in our result. 
Result so far: 22873.55
Subtract 3430 from 3600 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final result is 22873.55 with a remainder of 0.17.