We look at the division of 421561 by 26 
Let's see how many times 26 fits into 421561.

Moving on to step 1:
26 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 26

Moving on to step 2:
When dividing 42 by 26, we get 1 with a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 26 away from 42, we end up with 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 26

Going ahead to step 3:
The number 26 fits into 161 6 times, leaving a remainder of 5.
The next digit of our result is 6. 
Result so far: 16.0
The remainder is 5 after subtracting 156 from 161.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 26

Advancing to step 4:
26 goes into 55 2 times with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 162.0
Subtracting 52 from 55 leaves us with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 26

Let's proceed to step 5:
If we divide 36 by 26, we get 1 and a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 1621.0
If we subtract 26 from 36, we get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 26

Let's proceed to step 6:
101 divided by 26 is 3 with a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 16213.0
If we take 78 away from 101, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 7:
The number 26 fits into 230 8 times, leaving a remainder of 22.
Use 8 as the next digit of our solution. 
Result so far: 16213.8
Subtract 208 from 230 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.

Moving on to step 8:
The number 26 fits into 220 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 16213.88
If we take 208 away from 220, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 16213.88 with a remaining 0.012.