78313440 ÷ 641 
Our goal is to divide 78313440 by 641.

Let's proceed to step 1:
When dividing 7 by 641, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 641

Moving on to step 2:
78 divided by 641 is 0 with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Bring next digit (3) of the dividend behind the 78 and repeat the process: 783 / 641

Advancing to step 3:
The number 641 fits into 783 1 times, leaving a remainder of 142.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 641 from 783, we get 142.
Bring next digit (1) of the dividend behind the 142 and repeat the process: 1421 / 641

Advancing to step 4:
If we divide 1421 by 641, we get 2 and a remainder of 139.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 1282 from 1421 to get 139.
Grab the next digit (3) from the dividend, add it to 139, then carry on: 1393 / 641

Let's proceed to step 5:
1393 divided by 641 is 2 with a remainder of 111.
Record the quotient 2 as the next digit in the result. 
Result so far: 122.0
Subtract 1282 from 1393 to get 111.
Append the next digit (4) from the dividend to 111 and continue with: 1114 / 641

Let's proceed to step 6:
641 can be fit into 1114 1 times, resulting in a remainder of 473.
Write down 1 as next digit of the result. 
Result so far: 1221.0
Subtract 641 from 1114 to get 473.
Fetch the next digit (4) from the dividend, attach it to 473 and continue: 4734 / 641

Step 7:
641 goes into 4734 7 times with a remainder of 247.
Write down 7 as next digit of the result. 
Result so far: 12217.0
If we subtract 4487 from 4734, we get 247.
Bring next digit (0) of the dividend behind the 247 and repeat the process: 2470 / 641

Advancing to step 8:
641 goes into 2470 3 times with a remainder of 547.
Record the quotient 3 as the next digit in the result. 
Result so far: 122173.0
If we take 1923 away from 2470, we end up with 547.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

Going ahead to step 9:
The number 641 fits into 5470 8 times, leaving a remainder of 342.
The next digit of our result is 8. 
Result so far: 122173.8
Subtracting 5128 from 5470 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Advancing to step 10:
When dividing 3420 by 641, we get 5 with a remainder of 215.
Record the quotient 5 as the next digit in the result. 
Result so far: 122173.85
If we subtract 3205 from 3420, we get 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Going ahead to step 11:
If we divide 2150 by 641, we get 3 and a remainder of 227.
The number 3 becomes the next digit in our result. 
Result so far: 122173.853
Subtract 1923 from 2150 to get 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

On to step 12:
641 goes into 2270 3 times with a remainder of 347.
The next digit of our result is 3. 
Result so far: 122173.8533
Subtracting 1923 from 2270 leaves us with 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

The final result is 122173.8533 with a remainder of 0.00347.