Step 1:
The first step to converting 221609.99565603 to a fraction is to re-write 221609.99565603 in the form p/q where p and q are both positive integers. To start with, 221609.99565603 can be written as simply 221609.99565603/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 221609.99565603, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 221609.99565603/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 221609.99565603/1 each by 100000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 221609.99565603 as a fraction:
221610/1 / 1