686144 divided by 53 
We want to figure out the number of times 686144 can be divided by 53.

On to step 1:
The number 53 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 53

Moving on to step 2:
If we divide 68 by 53, we get 1 and a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 53 from 68 to get 15.
Append the next digit (6) from the dividend to 15 and continue with: 156 / 53

On to step 3:
53 goes into 156 2 times with a remainder of 50.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 106 from 156 to get 50.
Append the next digit (1) from the dividend to 50 and continue with: 501 / 53

Step 4:
The number 53 fits into 501 9 times, leaving a remainder of 24.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
Subtracting 477 from 501 leaves us with 24.
Bring next digit (4) of the dividend behind the 24 and repeat the process: 244 / 53

Going ahead to step 5:
When dividing 244 by 53, we get 4 with a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 1294.0
Deduct 212 from 244 and we're left with 32.
Bring next digit (4) of the dividend behind the 32 and repeat the process: 324 / 53

Going ahead to step 6:
If we divide 324 by 53, we get 6 and a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 12946.0
If we take 318 away from 324, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
60 divided by 53 is 1 with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 12946.1
Subtracting 53 from 60 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
70 divided by 53 is 1 with a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 12946.11
If we take 53 away from 70, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 12946.11, with a leftover of 0.017.