43039515 ÷ 864 
Let's see how many times 864 fits into 43039515.

Moving on to step 1:
The number 864 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 864

Let's proceed to step 2:
The number 864 fits into 43 0 times, leaving a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Bring next digit (0) of the dividend behind the 43 and repeat the process: 430 / 864

Step 3:
If we divide 430 by 864, we get 0 and a remainder of 430.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 430, we end up with 430.
Append the next digit (3) from the dividend to 430 and continue with: 4303 / 864

Advancing to step 4:
The number 864 fits into 4303 4 times, leaving a remainder of 847.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 847 after subtracting 3456 from 4303.
Take the next digit (9) from the dividend and append it to 847, then repeat: 8479 / 864

Advancing to step 5:
The number 864 fits into 8479 9 times, leaving a remainder of 703.
Use 9 as the next digit of our solution. 
Result so far: 49.0
If we take 7776 away from 8479, we end up with 703.
Take the next digit (5) from the dividend and append it to 703, then repeat: 7035 / 864

Let's proceed to step 6:
864 can be fit into 7035 8 times, resulting in a remainder of 123.
The next digit of our result is 8. 
Result so far: 498.0
If we take 6912 away from 7035, we end up with 123.
Fetch the next digit (1) from the dividend, attach it to 123 and continue: 1231 / 864

Step 7:
864 goes into 1231 1 times with a remainder of 367.
Write down 1 as next digit of the result. 
Result so far: 4981.0
The remainder is 367 after subtracting 864 from 1231.
Fetch the next digit (5) from the dividend, attach it to 367 and continue: 3675 / 864

Advancing to step 8:
3675 divided by 864 is 4 with a remainder of 219.
Put 4 as the next digit of the answer. 
Result so far: 49814.0
If we subtract 3456 from 3675, we get 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Moving on to step 9:
864 goes into 2190 2 times with a remainder of 462.
Record the quotient 2 as the next digit in the result. 
Result so far: 49814.2
The remainder is 462 after subtracting 1728 from 2190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Advancing to step 10:
When dividing 4620 by 864, we get 5 with a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 49814.25
The remainder is 300 after subtracting 4320 from 4620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 11:
If we divide 3000 by 864, we get 3 and a remainder of 408.
Put 3 as the next digit of the answer. 
Result so far: 49814.253
If we subtract 2592 from 3000, we get 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

On to step 12:
The number 864 fits into 4080 4 times, leaving a remainder of 624.
Write down 4 as next digit of the result. 
Result so far: 49814.2534
If we take 3456 away from 4080, we end up with 624.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

Moving on to step 13:
864 can be fit into 6240 7 times, resulting in a remainder of 192.
The next digit of our result is 7. 
Result so far: 49814.25347
If we subtract 6048 from 6240, we 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.

Moving on to step 14:
The number 864 fits into 1920 2 times, leaving a remainder of 192.
Put 2 as the next digit of the answer. 
Result so far: 49814.253472
If we subtract 1728 from 1920, we 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.

Going ahead to step 15:
1920 divided by 864 is 2 with a remainder of 192.
Put 2 as the next digit of the answer. 
Result so far: 49814.2534722
Deduct 1728 from 1920 and we're left 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.

The final outcome is 49814.2534722, with a leftover of 1.92e-06.