78258109 divided by 931 
We want to figure out the number of times 78258109 can be divided by 931.

Step 1:
If we divide 7 by 931, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 931

Moving on to step 2:
78 divided by 931 is 0 with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Append the next digit (2) from the dividend to 78 and continue with: 782 / 931

Moving on to step 3:
931 can be fit into 782 0 times, resulting in a remainder of 782.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 782 to get 782.
Include the next digit (5) from the dividend after 782, then repeat: 7825 / 931

Going ahead to step 4:
When dividing 7825 by 931, we get 8 with a remainder of 377.
The next digit of our result is 8. 
Result so far: 8.0
Subtract 7448 from 7825 to get 377.
Take the next digit (8) from the dividend and append it to 377, then repeat: 3778 / 931

Step 5:
931 can be fit into 3778 4 times, resulting in a remainder of 54.
The number 4 becomes the next digit in our result. 
Result so far: 84.0
If we take 3724 away from 3778, we end up with 54.
Append the next digit (1) from the dividend to 54 and continue with: 541 / 931

Let's proceed to step 6:
The number 931 fits into 541 0 times, leaving a remainder of 541.
Write down 0 as next digit of the result. 
Result so far: 840.0
Subtracting 0 from 541 leaves us with 541.
Include the next digit (0) from the dividend after 541, then repeat: 5410 / 931

Step 7:
When dividing 5410 by 931, we get 5 with a remainder of 755.
The next digit of our result is 5. 
Result so far: 8405.0
If we subtract 4655 from 5410, we get 755.
Include the next digit (9) from the dividend after 755, then repeat: 7559 / 931

On to step 8:
931 goes into 7559 8 times with a remainder of 111.
Write down 8 as next digit of the result. 
Result so far: 84058.0
If we subtract 7448 from 7559, we get 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 9:
The number 931 fits into 1110 1 times, leaving a remainder of 179.
Put 1 as the next digit of the answer. 
Result so far: 84058.1
Subtract 931 from 1110 to get 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

On to step 10:
The number 931 fits into 1790 1 times, leaving a remainder of 859.
Record the quotient 1 as the next digit in the result. 
Result so far: 84058.11
Subtracting 931 from 1790 leaves us with 859.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8590, and continue the process.

In conclusion, the division gives 84058.11 with a balance of 0.859.