Step 1:
The first step to converting 209645.9438573 to a fraction is to re-write 209645.9438573 in the form p/q where p and q are both positive integers. To start with, 209645.9438573 can be written as simply 209645.9438573/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 209645.9438573, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 209645.9438573/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 209645.9438573/1 each by 10000000:
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 209645.9438573 as a fraction:
209646/1 / 1