Finding the Third Proportional to 639,080 and 978,012

Step by Step Solution

1. Step 1: Write the proportion equation
   639,080 : 978,012 = 978,012 : x
2. Step 2: Convert to fraction form
   639,080/978,012 = 978,012/x
3. Step 3: Cross multiply
   639,080x = 978,012 × 978,012
4. Step 4: Simplify right side
   639,080x = 956,507,472,144
5. Step 5: Solve for x
   x = 956,507,472,144/639,080
6. Step 6: Final answer
   x = 1,496,694.42