Finding the Third Proportional to 487,626 and 647,020.50

Step by Step Solution

1. Step 1: Write the proportion equation
   487,626 : 647,020.50 = 647,020.50 : x
2. Step 2: Convert to fraction form
   487,626/647,020.50 = 647,020.50/x
3. Step 3: Cross multiply
   487,626x = 647,020.50 × 647,020.50
4. Step 4: Simplify right side
   487,626x = 418,635,527,420.25
5. Step 5: Solve for x
   x = 418,635,527,420.25/487,626
6. Step 6: Final answer
   x = 858,517.65