Step 1:
The first step to converting 645133.4426663 to a fraction is to re-write 645133.4426663 in the form p/q where p and q are both positive integers. To start with, 645133.4426663 can be written as simply 645133.4426663/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 645133.4426663, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 645133.4426663/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 645133.4426663/1 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 645133.4426663 as a fraction:
645133/1 / 1