Step 1:
The first step to converting 28209.868959399 to a fraction is to re-write 28209.868959399 in the form p/q where p and q are both positive integers. To start with, 28209.868959399 can be written as simply 28209.868959399/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 28209.868959399, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 28209.868959399/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 28209.868959399/1 each by 1000000000:
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 28209.868959399 as a fraction:
197469/7 / 1