We're dividing 86404 by 87 
We're looking to find how many times 87 goes into 86404.

On to step 1:
The number 87 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 87

Step 2:
When dividing 86 by 87, we get 0 with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Take the next digit (4) from the dividend and append it to 86, then repeat: 864 / 87

On to step 3:
When dividing 864 by 87, we get 9 with a remainder of 81.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 783 from 864 to get 81.
Include the next digit (0) from the dividend after 81, then repeat: 810 / 87

On to step 4:
87 goes into 810 9 times with a remainder of 27.
Put 9 as the next digit of the answer. 
Result so far: 99.0
Subtract 783 from 810 to get 27.
Include the next digit (4) from the dividend after 27, then repeat: 274 / 87

Step 5:
The number 87 fits into 274 3 times, leaving a remainder of 13.
The next digit of our result is 3. 
Result so far: 993.0
Deduct 261 from 274 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 6:
130 divided by 87 is 1 with a remainder of 43.
Write down 1 as next digit of the result. 
Result so far: 993.1
The remainder is 43 after subtracting 87 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 7:
If we divide 430 by 87, we get 4 and a remainder of 82.
The next digit of our result is 4. 
Result so far: 993.14
Subtracting 348 from 430 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Step 8:
When dividing 820 by 87, we get 9 with a remainder of 37.
Put 9 as the next digit of the answer. 
Result so far: 993.149
Deduct 783 from 820 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 9:
370 divided by 87 is 4 with a remainder of 22.
The number 4 becomes the next digit in our result. 
Result so far: 993.1494
Subtract 348 from 370 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 10:
87 can be fit into 220 2 times, resulting in a remainder of 46.
Write down 2 as next digit of the result. 
Result so far: 993.14942
If we subtract 174 from 220, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 11:
460 divided by 87 is 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 993.149425
If we take 435 away from 460, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 12:
When dividing 250 by 87, we get 2 with a remainder of 76.
Use 2 as the next digit of our solution. 
Result so far: 993.1494252
The remainder is 76 after subtracting 174 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 13:
If we divide 760 by 87, we get 8 and a remainder of 64.
Use 8 as the next digit of our solution. 
Result so far: 993.14942528
Subtract 696 from 760 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The quotient of the division is 993.14942528, and the remainder is 6.4e-08.