We look at the division of 21515778 by 689 
We're looking to find how many times 689 goes into 21515778.

Going ahead to step 1:
689 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 689

On to step 2:
When dividing 21 by 689, we get 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 689

Going ahead to step 3:
The number 689 fits into 215 0 times, leaving a remainder of 215.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Bring next digit (1) of the dividend behind the 215 and repeat the process: 2151 / 689

Step 4:
If we divide 2151 by 689, we get 3 and a remainder of 84.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 2067 from 2151 to get 84.
Grab the next digit (5) from the dividend, add it to 84, then carry on: 845 / 689

Step 5:
If we divide 845 by 689, we get 1 and a remainder of 156.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
If we take 689 away from 845, we end up with 156.
Bring next digit (7) of the dividend behind the 156 and repeat the process: 1567 / 689

Going ahead to step 6:
1567 divided by 689 is 2 with a remainder of 189.
The next digit of our result is 2. 
Result so far: 312.0
If we subtract 1378 from 1567, we get 189.
Append the next digit (7) from the dividend to 189 and continue with: 1897 / 689

Advancing to step 7:
The number 689 fits into 1897 2 times, leaving a remainder of 519.
Write down 2 as next digit of the result. 
Result so far: 3122.0
If we take 1378 away from 1897, we end up with 519.
Fetch the next digit (8) from the dividend, attach it to 519 and continue: 5198 / 689

Let's proceed to step 8:
The number 689 fits into 5198 7 times, leaving a remainder of 375.
Use 7 as the next digit of our solution. 
Result so far: 31227.0
The remainder is 375 after subtracting 4823 from 5198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Moving on to step 9:
When dividing 3750 by 689, we get 5 with a remainder of 305.
The number 5 becomes the next digit in our result. 
Result so far: 31227.5
Subtract 3445 from 3750 to get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Step 10:
If we divide 3050 by 689, we get 4 and a remainder of 294.
Write down 4 as next digit of the result. 
Result so far: 31227.54
The remainder is 294 after subtracting 2756 from 3050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

Moving on to step 11:
When dividing 2940 by 689, we get 4 with a remainder of 184.
Write down 4 as next digit of the result. 
Result so far: 31227.544
Subtract 2756 from 2940 to get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

The final outcome is 31227.544, with a leftover of 0.0184.