Let's divide 54186587 by 420
Our goal is to divide 54186587 by 420.

Moving on to step 1:
5 divided by 420 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 420

Going ahead to step 2:
54 divided by 420 is 0 with a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 54, we end up with 54.
Bring next digit (1) of the dividend behind the 54 and repeat the process: 541 / 420

Let's proceed to step 3:
When dividing 541 by 420, we get 1 with a remainder of 121.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 121 after subtracting 420 from 541.
Include the next digit (8) from the dividend after 121, then repeat: 1218 / 420

Let's proceed to step 4:
420 can be fit into 1218 2 times, resulting in a remainder of 378.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 378 after subtracting 840 from 1218.
Take the next digit (6) from the dividend and append it to 378, then repeat: 3786 / 420

Moving on to step 5:
If we divide 3786 by 420, we get 9 and a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 129.0
If we take 3780 away from 3786, we end up with 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 420

Going ahead to step 6:
The number 420 fits into 65 0 times, leaving a remainder of 65.
Write down 0 as next digit of the result. 
Result so far: 1290.0
If we take 0 away from 65, we end up with 65.
Include the next digit (8) from the dividend after 65, then repeat: 658 / 420

Going ahead to step 7:
420 can be fit into 658 1 times, resulting in a remainder of 238.
The number 1 becomes the next digit in our result. 
Result so far: 12901.0
Deduct 420 from 658 and we're left with 238.
Append the next digit (7) from the dividend to 238 and continue with: 2387 / 420

Advancing to step 8:
When dividing 2387 by 420, we get 5 with a remainder of 287.
The next digit of our result is 5. 
Result so far: 129015.0
Subtract 2100 from 2387 to get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Step 9:
The number 420 fits into 2870 6 times, leaving a remainder of 350.
The next digit of our result is 6. 
Result so far: 129015.6
The remainder is 350 after subtracting 2520 from 2870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 10:
3500 divided by 420 is 8 with a remainder of 140.
Put 8 as the next digit of the answer. 
Result so far: 129015.68
If we subtract 3360 from 3500, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 11:
The number 420 fits into 1400 3 times, leaving a remainder of 140.
Use 3 as the next digit of our solution. 
Result so far: 129015.683
If we subtract 1260 from 1400, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 12:
The number 420 fits into 1400 3 times, leaving a remainder of 140.
The number 3 becomes the next digit in our result. 
Result so far: 129015.6833
The remainder is 140 after subtracting 1260 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

In conclusion, the division gives 129015.6833 with a balance of 0.0014.