We're dividing 764561 by 21 
Our goal is to divide 764561 by 21.

Advancing to step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (6) from the dividend to 7 and continue with: 76 / 21

Step 2:
When dividing 76 by 21, we get 3 with a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 63 away from 76, we end up with 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 21

Going ahead to step 3:
134 divided by 21 is 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
The remainder is 8 after subtracting 126 from 134.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 21

Let's proceed to step 4:
85 divided by 21 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 364.0
Deduct 84 from 85 and we're left with 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 21

Advancing to step 5:
The number 21 fits into 16 0 times, leaving a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 3640.0
If we subtract 0 from 16, we get 16.
Grab the next digit (1) from the dividend, add it to 16, then carry on: 161 / 21

Going ahead to step 6:
If we divide 161 by 21, we get 7 and a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 36407.0
Deduct 147 from 161 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 7:
The number 21 fits into 140 6 times, leaving a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 36407.6
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 8:
21 can be fit into 140 6 times, resulting in a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 36407.66
If we subtract 126 from 140, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 36407.66, with a leftover of 0.014.