We're dividing 15403772 by 686 
We want to figure out the number of times 15403772 can be divided by 686.

On to step 1:
686 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 686

Moving on to step 2:
If we divide 15 by 686, we get 0 and a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 686

Going ahead to step 3:
686 can be fit into 154 0 times, resulting in a remainder of 154.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 154 and we're left with 154.
Fetch the next digit (0) from the dividend, attach it to 154 and continue: 1540 / 686

Going ahead to step 4:
1540 divided by 686 is 2 with a remainder of 168.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1372 away from 1540, we end up with 168.
Fetch the next digit (3) from the dividend, attach it to 168 and continue: 1683 / 686

Step 5:
When dividing 1683 by 686, we get 2 with a remainder of 311.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
If we take 1372 away from 1683, we end up with 311.
Grab the next digit (7) from the dividend, add it to 311, then carry on: 3117 / 686

Step 6:
686 goes into 3117 4 times with a remainder of 373.
Put 4 as the next digit of the answer. 
Result so far: 224.0
Subtracting 2744 from 3117 leaves us with 373.
Grab the next digit (7) from the dividend, add it to 373, then carry on: 3737 / 686

Moving on to step 7:
The number 686 fits into 3737 5 times, leaving a remainder of 307.
Use 5 as the next digit of our solution. 
Result so far: 2245.0
If we take 3430 away from 3737, we end up with 307.
Bring next digit (2) of the dividend behind the 307 and repeat the process: 3072 / 686

Step 8:
686 goes into 3072 4 times with a remainder of 328.
Put 4 as the next digit of the answer. 
Result so far: 22454.0
If we take 2744 away from 3072, we end up with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

On to step 9:
If we divide 3280 by 686, we get 4 and a remainder of 536.
The number 4 becomes the next digit in our result. 
Result so far: 22454.4
Deduct 2744 from 3280 and we're left with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Step 10:
If we divide 5360 by 686, we get 7 and a remainder of 558.
The next digit of our result is 7. 
Result so far: 22454.47
Subtracting 4802 from 5360 leaves us with 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Step 11:
686 goes into 5580 8 times with a remainder of 92.
The number 8 becomes the next digit in our result. 
Result so far: 22454.478
Subtract 5488 from 5580 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Step 12:
686 goes into 920 1 times with a remainder of 234.
The number 1 becomes the next digit in our result. 
Result so far: 22454.4781
If we subtract 686 from 920, we get 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

Let's proceed to step 13:
The number 686 fits into 2340 3 times, leaving a remainder of 282.
Use 3 as the next digit of our solution. 
Result so far: 22454.47813
Subtract 2058 from 2340 to get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

On to step 14:
The number 686 fits into 2820 4 times, leaving a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 22454.478134
Subtract 2744 from 2820 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 15:
686 goes into 760 1 times with a remainder of 74.
The number 1 becomes the next digit in our result. 
Result so far: 22454.4781341
Deduct 686 from 760 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 16:
686 goes into 740 1 times with a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 22454.47813411
Deduct 686 from 740 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 22454.47813411, with a leftover of 5.4e-08.