Use long division.
1. If the number you're dividing by has a decimal, move the decimal point all the way to the right counting the number of places you've moved it to. Then move the decimal point in the number you're dividing the same number of places to the right.
2. Insert a decimal point in the quotient (answer) space, exactly above the decimal point in the number under the division bar.
3. Divide until the remainder is zero, or until you have enough decimal places in your answer. You can also stop if the remainder repeats because this indicates that your answer is a repeating decimal.
0 3 5 9
22| 7898
-0
—————-
78
- 66
—————
1 2 9
- 1 1 0
—————
1 9 8
- 1 9 8
——————
0
So the answer is 359.