Let's divide 3109859 by 78
We're looking to find how many times 78 goes into 3109859.

On to step 1:
The number 78 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 78

Going ahead to step 2:
78 can be fit into 31 0 times, resulting in a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Append the next digit (0) from the dividend to 31 and continue with: 310 / 78

Advancing to step 3:
78 can be fit into 310 3 times, resulting in a remainder of 76.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 234 from 310 to get 76.
Fetch the next digit (9) from the dividend, attach it to 76 and continue: 769 / 78

Advancing to step 4:
769 divided by 78 is 9 with a remainder of 67.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Deduct 702 from 769 and we're left with 67.
Take the next digit (8) from the dividend and append it to 67, then repeat: 678 / 78

Step 5:
The number 78 fits into 678 8 times, leaving a remainder of 54.
The next digit of our result is 8. 
Result so far: 398.0
If we subtract 624 from 678, we get 54.
Include the next digit (5) from the dividend after 54, then repeat: 545 / 78

Going ahead to step 6:
The number 78 fits into 545 6 times, leaving a remainder of 77.
Write down 6 as next digit of the result. 
Result so far: 3986.0
The remainder is 77 after subtracting 468 from 545.
Take the next digit (9) from the dividend and append it to 77, then repeat: 779 / 78

Let's proceed to step 7:
78 goes into 779 9 times with a remainder of 77.
The next digit of our result is 9. 
Result so far: 39869.0
Subtracting 702 from 779 leaves us with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Let's proceed to step 8:
The number 78 fits into 770 9 times, leaving a remainder of 68.
Put 9 as the next digit of the answer. 
Result so far: 39869.9
Subtracting 702 from 770 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 9:
78 can be fit into 680 8 times, resulting in a remainder of 56.
Write down 8 as next digit of the result. 
Result so far: 39869.98
If we subtract 624 from 680, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 10:
When dividing 560 by 78, we get 7 with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 39869.987
If we subtract 546 from 560, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
140 divided by 78 is 1 with a remainder of 62.
The next digit of our result is 1. 
Result so far: 39869.9871
Subtract 78 from 140 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 12:
When dividing 620 by 78, we get 7 with a remainder of 74.
Put 7 as the next digit of the answer. 
Result so far: 39869.98717
The remainder is 74 after subtracting 546 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 13:
The number 78 fits into 740 9 times, leaving a remainder of 38.
Write down 9 as next digit of the result. 
Result so far: 39869.987179
Deduct 702 from 740 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 14:
78 goes into 380 4 times with a remainder of 68.
Record the quotient 4 as the next digit in the result. 
Result so far: 39869.9871794
If we take 312 away from 380, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 15:
The number 78 fits into 680 8 times, leaving a remainder of 56.
Record the quotient 8 as the next digit in the result. 
Result so far: 39869.98717948
Deduct 624 from 680 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Our division results in 39869.98717948 with a remaining 5.6e-08.