Step 1:
The first step to converting 22190840.215913 to a fraction is to re-write 22190840.215913 in the form p/q where p and q are both positive integers. To start with, 22190840.215913 can be written as simply 22190840.215913/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 22190840.215913, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 22190840.215913/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 22190840.215913/1 each by 1000000:
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 22190840.215913 as a fraction:
22190840/1 / 1