We're dividing 78991673 by 420 
Our goal is to divide 78991673 by 420.

On to step 1:
420 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 420

Going ahead to step 2:
When dividing 78 by 420, we get 0 with a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Fetch the next digit (9) from the dividend, attach it to 78 and continue: 789 / 420

Going ahead to step 3:
The number 420 fits into 789 1 times, leaving a remainder of 369.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 420 from 789, we get 369.
Grab the next digit (9) from the dividend, add it to 369, then carry on: 3699 / 420

Let's proceed to step 4:
If we divide 3699 by 420, we get 8 and a remainder of 339.
Use 8 as the next digit of our solution. 
Result so far: 18.0
The remainder is 339 after subtracting 3360 from 3699.
Take the next digit (1) from the dividend and append it to 339, then repeat: 3391 / 420

Going ahead to step 5:
420 can be fit into 3391 8 times, resulting in a remainder of 31.
Use 8 as the next digit of our solution. 
Result so far: 188.0
The remainder is 31 after subtracting 3360 from 3391.
Take the next digit (6) from the dividend and append it to 31, then repeat: 316 / 420

Moving on to step 6:
316 divided by 420 is 0 with a remainder of 316.
Record the quotient 0 as the next digit in the result. 
Result so far: 1880.0
Deduct 0 from 316 and we're left with 316.
Append the next digit (7) from the dividend to 316 and continue with: 3167 / 420

Going ahead to step 7:
420 can be fit into 3167 7 times, resulting in a remainder of 227.
The number 7 becomes the next digit in our result. 
Result so far: 18807.0
The remainder is 227 after subtracting 2940 from 3167.
Include the next digit (3) from the dividend after 227, then repeat: 2273 / 420

Moving on to step 8:
If we divide 2273 by 420, we get 5 and a remainder of 173.
Write down 5 as next digit of the result. 
Result so far: 188075.0
The remainder is 173 after subtracting 2100 from 2273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

Step 9:
The number 420 fits into 1730 4 times, leaving a remainder of 50.
The next digit of our result is 4. 
Result so far: 188075.4
Deduct 1680 from 1730 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 10:
If we divide 500 by 420, we get 1 and a remainder of 80.
Use 1 as the next digit of our solution. 
Result so far: 188075.41
If we subtract 420 from 500, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 11:
When dividing 800 by 420, we get 1 with a remainder of 380.
Record the quotient 1 as the next digit in the result. 
Result so far: 188075.411
If we take 420 away from 800, we end up with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

In conclusion, the division gives 188075.411 with a balance of 0.038.