Step 1: Identify the number of decimal places

The decimal 7.638908 has 6 decimal places.

Step 2: Multiply by the appropriate power of 10

Multiply by 10⁶ = 1000000 to eliminate the decimal point.

7.638908 × 1000000 = 7638908

Step 3: Write as a fraction

Step 4: Simplify the fraction

Find the greatest common divisor (GCD) of 7638908 and 1000000.

GCD(7638908, 1000000) = 4

Divide both the numerator and denominator by the GCD: