We divide 421479 by 90
Our goal is to divide 421479 by 90.

Step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 90

Moving on to step 2:
90 goes into 42 0 times with a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Bring next digit (1) of the dividend behind the 42 and repeat the process: 421 / 90

Step 3:
90 can be fit into 421 4 times, resulting in a remainder of 61.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 360 from 421 leaves us with 61.
Include the next digit (4) from the dividend after 61, then repeat: 614 / 90

Let's proceed to step 4:
The number 90 fits into 614 6 times, leaving a remainder of 74.
Write down 6 as next digit of the result. 
Result so far: 46.0
Deduct 540 from 614 and we're left with 74.
Append the next digit (7) from the dividend to 74 and continue with: 747 / 90

Advancing to step 5:
90 can be fit into 747 8 times, resulting in a remainder of 27.
Use 8 as the next digit of our solution. 
Result so far: 468.0
If we take 720 away from 747, we end up with 27.
Fetch the next digit (9) from the dividend, attach it to 27 and continue: 279 / 90

Let's proceed to step 6:
The number 90 fits into 279 3 times, leaving a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 4683.0
The remainder is 9 after subtracting 270 from 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
90 can be fit into 90 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 4683.1
Deduct 90 from 90 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4683.1
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
When dividing 0 by 90, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4683.1
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 4683.1 with a balance of 0.0.