Finding the Third Proportional to 147,609 and 318,550.50

Step by Step Solution

1. Step 1: Write the proportion equation
   147,609 : 318,550.50 = 318,550.50 : x
2. Step 2: Convert to fraction form
   147,609/318,550.50 = 318,550.50/x
3. Step 3: Cross multiply
   147,609x = 318,550.50 × 318,550.50
4. Step 4: Simplify right side
   147,609x = 101,474,421,050.25
5. Step 5: Solve for x
   x = 101,474,421,050.25/147,609
6. Step 6: Final answer
   x = 687,454.16