Step 1:
The first step to converting 19972.8789 to a fraction is to re-write 19972.8789 in the form p/q where p and q are both positive integers. To start with, 19972.8789 can be written as simply 19972.8789/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 19972.8789, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 19972.8789/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 19972.8789/1 each by 10000:
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 19972.8789 as a fraction:
159783/8 / 1