We're dividing 89151978 by 904 
We want to figure out the number of times 89151978 can be divided by 904.

Let's proceed to step 1:
The number 904 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 904

Advancing to step 2:
904 can be fit into 89 0 times, resulting in a remainder of 89.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 89 after subtracting 0 from 89.
Bring next digit (1) of the dividend behind the 89 and repeat the process: 891 / 904

On to step 3:
904 goes into 891 0 times with a remainder of 891.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 891 leaves us with 891.
Include the next digit (5) from the dividend after 891, then repeat: 8915 / 904

On to step 4:
8915 divided by 904 is 9 with a remainder of 779.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 8136 away from 8915, we end up with 779.
Include the next digit (1) from the dividend after 779, then repeat: 7791 / 904

Advancing to step 5:
If we divide 7791 by 904, we get 8 and a remainder of 559.
Put 8 as the next digit of the answer. 
Result so far: 98.0
Subtract 7232 from 7791 to get 559.
Grab the next digit (9) from the dividend, add it to 559, then carry on: 5599 / 904

Moving on to step 6:
5599 divided by 904 is 6 with a remainder of 175.
Record the quotient 6 as the next digit in the result. 
Result so far: 986.0
Subtract 5424 from 5599 to get 175.
Bring next digit (7) of the dividend behind the 175 and repeat the process: 1757 / 904

Step 7:
The number 904 fits into 1757 1 times, leaving a remainder of 853.
Put 1 as the next digit of the answer. 
Result so far: 9861.0
The remainder is 853 after subtracting 904 from 1757.
Bring next digit (8) of the dividend behind the 853 and repeat the process: 8538 / 904

Moving on to step 8:
The number 904 fits into 8538 9 times, leaving a remainder of 402.
The next digit of our result is 9. 
Result so far: 98619.0
Subtract 8136 from 8538 to get 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Step 9:
4020 divided by 904 is 4 with a remainder of 404.
Use 4 as the next digit of our solution. 
Result so far: 98619.4
Subtracting 3616 from 4020 leaves us with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

On to step 10:
904 can be fit into 4040 4 times, resulting in a remainder of 424.
The next digit of our result is 4. 
Result so far: 98619.44
Subtracting 3616 from 4040 leaves us with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

The final outcome is 98619.44, with a leftover of 0.424.