Step 1:
The first step to converting 670408.7649754 to a fraction is to re-write 670408.7649754 in the form p/q where p and q are both positive integers. To start with, 670408.7649754 can be written as simply 670408.7649754/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 670408.7649754, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 670408.7649754/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 670408.7649754/1 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 670408.7649754 as a fraction:
670409/1 / 1