We look at the division of 21518543 by 778 
Our goal is to divide 21518543 by 778.

Going ahead to step 1:
If we divide 2 by 778, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 778

On to step 2:
778 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
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 / 778

On to step 3:
778 goes into 215 0 times with 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.
Fetch the next digit (1) from the dividend, attach it to 215 and continue: 2151 / 778

Moving on to step 4:
The number 778 fits into 2151 2 times, leaving a remainder of 595.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1556 away from 2151, we end up with 595.
Take the next digit (8) from the dividend and append it to 595, then repeat: 5958 / 778

Advancing to step 5:
778 can be fit into 5958 7 times, resulting in a remainder of 512.
Write down 7 as next digit of the result. 
Result so far: 27.0
Deduct 5446 from 5958 and we're left with 512.
Fetch the next digit (5) from the dividend, attach it to 512 and continue: 5125 / 778

Going ahead to step 6:
The number 778 fits into 5125 6 times, leaving a remainder of 457.
Use 6 as the next digit of our solution. 
Result so far: 276.0
If we take 4668 away from 5125, we end up with 457.
Take the next digit (4) from the dividend and append it to 457, then repeat: 4574 / 778

Going ahead to step 7:
4574 divided by 778 is 5 with a remainder of 684.
The next digit of our result is 5. 
Result so far: 2765.0
The remainder is 684 after subtracting 3890 from 4574.
Grab the next digit (3) from the dividend, add it to 684, then carry on: 6843 / 778

Going ahead to step 8:
778 can be fit into 6843 8 times, resulting in a remainder of 619.
The next digit of our result is 8. 
Result so far: 27658.0
Deduct 6224 from 6843 and we're left with 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

On to step 9:
6190 divided by 778 is 7 with a remainder of 744.
The number 7 becomes the next digit in our result. 
Result so far: 27658.7
The remainder is 744 after subtracting 5446 from 6190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Going ahead to step 10:
When dividing 7440 by 778, we get 9 with a remainder of 438.
Use 9 as the next digit of our solution. 
Result so far: 27658.79
Subtract 7002 from 7440 to get 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Moving on to step 11:
If we divide 4380 by 778, we get 5 and a remainder of 490.
The number 5 becomes the next digit in our result. 
Result so far: 27658.795
Deduct 3890 from 4380 and we're left with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Let's proceed to step 12:
When dividing 4900 by 778, we get 6 with a remainder of 232.
The next digit of our result is 6. 
Result so far: 27658.7956
Deduct 4668 from 4900 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Step 13:
If we divide 2320 by 778, we get 2 and a remainder of 764.
The next digit of our result is 2. 
Result so far: 27658.79562
If we take 1556 away from 2320, we end up with 764.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7640, and continue the process.

Going ahead to step 14:
The number 778 fits into 7640 9 times, leaving a remainder of 638.
The number 9 becomes the next digit in our result. 
Result so far: 27658.795629
Subtract 7002 from 7640 to get 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Step 15:
778 can be fit into 6380 8 times, resulting in a remainder of 156.
The number 8 becomes the next digit in our result. 
Result so far: 27658.7956298
The remainder is 156 after subtracting 6224 from 6380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Let's proceed to step 16:
778 goes into 1560 2 times with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 27658.79562982
Deduct 1556 from 1560 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 27658.79562982 with a balance of 4e-09.