402639 ÷ 89 
Let's see how many times 89 fits into 402639.

Advancing to step 1:
When dividing 4 by 89, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 89

Advancing to step 2:
40 divided by 89 is 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 40, we end up with 40.
Bring next digit (2) of the dividend behind the 40 and repeat the process: 402 / 89

On to step 3:
89 can be fit into 402 4 times, resulting in a remainder of 46.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 46 after subtracting 356 from 402.
Grab the next digit (6) from the dividend, add it to 46, then carry on: 466 / 89

Going ahead to step 4:
89 can be fit into 466 5 times, resulting in a remainder of 21.
Put 5 as the next digit of the answer. 
Result so far: 45.0
Subtracting 445 from 466 leaves us with 21.
Append the next digit (3) from the dividend to 21 and continue with: 213 / 89

Moving on to step 5:
213 divided by 89 is 2 with a remainder of 35.
Put 2 as the next digit of the answer. 
Result so far: 452.0
If we subtract 178 from 213, we get 35.
Grab the next digit (9) from the dividend, add it to 35, then carry on: 359 / 89

Step 6:
The number 89 fits into 359 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 4524.0
If we take 356 away from 359, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
If we divide 30 by 89, we get 0 and a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 4524.0
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
When dividing 300 by 89, we get 3 with a remainder of 33.
Use 3 as the next digit of our solution. 
Result so far: 4524.03
The remainder is 33 after subtracting 267 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 9:
89 can be fit into 330 3 times, resulting in a remainder of 63.
Write down 3 as next digit of the result. 
Result so far: 4524.033
Deduct 267 from 330 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

The final outcome is 4524.033, with a leftover of 0.0063.