We're dividing 643978 by 26 
Let's see how many times 26 fits into 643978.

Advancing to step 1:
26 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 26

Step 2:
If we divide 64 by 26, we get 2 and a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 52 from 64 leaves us with 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 26

Let's proceed to step 3:
26 can be fit into 123 4 times, resulting in a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 24.0
If we take 104 away from 123, we end up with 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 26

Going ahead to step 4:
When dividing 199 by 26, we get 7 with a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 247.0
The remainder is 17 after subtracting 182 from 199.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 26

On to step 5:
If we divide 177 by 26, we get 6 and a remainder of 21.
The number 6 becomes the next digit in our result. 
Result so far: 2476.0
Subtracting 156 from 177 leaves us with 21.
Fetch the next digit (8) from the dividend, attach it to 21 and continue: 218 / 26

Going ahead to step 6:
When dividing 218 by 26, we get 8 with a remainder of 10.
The next digit of our result is 8. 
Result so far: 24768.0
Subtracting 208 from 218 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
The number 26 fits into 100 3 times, leaving a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 24768.3
Subtract 78 from 100 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 8:
26 goes into 220 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 24768.38
If we subtract 208 from 220, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
120 divided by 26 is 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 24768.384
Subtracting 104 from 120 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
If we divide 160 by 26, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 24768.3846
Subtract 156 from 160 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
26 goes into 40 1 times with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 24768.38461
Deduct 26 from 40 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 12:
26 goes into 140 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 24768.384615
Subtracting 130 from 140 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 13:
The number 26 fits into 100 3 times, leaving a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 24768.3846153
If we take 78 away from 100, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 14:
If we divide 220 by 26, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 24768.38461538
Deduct 208 from 220 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 24768.38461538 with a remaining 1.2e-08.