86123473 divided by 84 
Our goal is to divide 86123473 by 84.

Going ahead to step 1:
When dividing 8 by 84, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 84

Let's proceed to step 2:
86 divided by 84 is 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 84 away from 86, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 84

Moving on to step 3:
The number 84 fits into 21 0 times, leaving a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 21 after subtracting 0 from 21.
Fetch the next digit (2) from the dividend, attach it to 21 and continue: 212 / 84

Moving on to step 4:
The number 84 fits into 212 2 times, leaving a remainder of 44.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
Subtracting 168 from 212 leaves us with 44.
Grab the next digit (3) from the dividend, add it to 44, then carry on: 443 / 84

On to step 5:
If we divide 443 by 84, we get 5 and a remainder of 23.
The number 5 becomes the next digit in our result. 
Result so far: 1025.0
Deduct 420 from 443 and we're left with 23.
Grab the next digit (4) from the dividend, add it to 23, then carry on: 234 / 84

Step 6:
When dividing 234 by 84, we get 2 with a remainder of 66.
Write down 2 as next digit of the result. 
Result so far: 10252.0
Deduct 168 from 234 and we're left with 66.
Grab the next digit (7) from the dividend, add it to 66, then carry on: 667 / 84

Moving on to step 7:
84 can be fit into 667 7 times, resulting in a remainder of 79.
The next digit of our result is 7. 
Result so far: 102527.0
The remainder is 79 after subtracting 588 from 667.
Append the next digit (3) from the dividend to 79 and continue with: 793 / 84

On to step 8:
84 goes into 793 9 times with a remainder of 37.
The number 9 becomes the next digit in our result. 
Result so far: 1025279.0
Subtracting 756 from 793 leaves us 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.

Going ahead to step 9:
84 can be fit into 370 4 times, resulting in a remainder of 34.
Record the quotient 4 as the next digit in the result. 
Result so far: 1025279.4
Deduct 336 from 370 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 10:
340 divided by 84 is 4 with a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 1025279.44
Deduct 336 from 340 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 1025279.44 with a remaining 0.004.