Step 1:
The first step to converting 217212001.4359 to a fraction is to re-write 217212001.4359 in the form p/q where p and q are both positive integers. To start with, 217212001.4359 can be written as simply 217212001.4359/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 217212001.4359, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 217212001.4359/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 217212001.4359/1 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 217212001.4359 as a fraction:
217212001/1 / 1