7915458 ÷ 864 
Let's see how many times 864 fits into 7915458.

On to step 1:
When dividing 7 by 864, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 864

Let's proceed to step 2:
864 can be fit into 79 0 times, resulting in a remainder of 79.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 79 after subtracting 0 from 79.
Fetch the next digit (1) from the dividend, attach it to 79 and continue: 791 / 864

Step 3:
The number 864 fits into 791 0 times, leaving a remainder of 791.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 791 after subtracting 0 from 791.
Bring next digit (5) of the dividend behind the 791 and repeat the process: 7915 / 864

Advancing to step 4:
864 can be fit into 7915 9 times, resulting in a remainder of 139.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 7776 from 7915 and we're left with 139.
Append the next digit (4) from the dividend to 139 and continue with: 1394 / 864

Advancing to step 5:
864 goes into 1394 1 times with a remainder of 530.
The next digit of our result is 1. 
Result so far: 91.0
If we subtract 864 from 1394, we get 530.
Take the next digit (5) from the dividend and append it to 530, then repeat: 5305 / 864

On to step 6:
5305 divided by 864 is 6 with a remainder of 121.
Put 6 as the next digit of the answer. 
Result so far: 916.0
If we take 5184 away from 5305, we end up with 121.
Grab the next digit (8) from the dividend, add it to 121, then carry on: 1218 / 864

Advancing to step 7:
864 goes into 1218 1 times with a remainder of 354.
Record the quotient 1 as the next digit in the result. 
Result so far: 9161.0
Subtracting 864 from 1218 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Let's proceed to step 8:
864 can be fit into 3540 4 times, resulting in a remainder of 84.
Write down 4 as next digit of the result. 
Result so far: 9161.4
Subtract 3456 from 3540 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 9:
When dividing 840 by 864, we get 0 with a remainder of 840.
The next digit of our result is 0. 
Result so far: 9161.4
If we take 0 away from 840, we end up with 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8400, and continue the process.

On to step 10:
864 can be fit into 8400 9 times, resulting in a remainder of 624.
Use 9 as the next digit of our solution. 
Result so far: 9161.409
Subtract 7776 from 8400 to get 624.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

Step 11:
6240 divided by 864 is 7 with a remainder of 192.
The number 7 becomes the next digit in our result. 
Result so far: 9161.4097
If we take 6048 away from 6240, we end up with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 12:
1920 divided by 864 is 2 with a remainder of 192.
Record the quotient 2 as the next digit in the result. 
Result so far: 9161.40972
If we take 1728 away from 1920, we end up with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 13:
If we divide 1920 by 864, we get 2 and a remainder of 192.
Use 2 as the next digit of our solution. 
Result so far: 9161.409722
Subtract 1728 from 1920 to get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

The final outcome is 9161.409722, with a leftover of 1.92e-05.