Finding the Third Proportional to 243,284.50 and 387,410.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,284.50 : 387,410.50 = 387,410.50 : x
2. Step 2: Convert to fraction form
   243,284.50/387,410.50 = 387,410.50/x
3. Step 3: Cross multiply
   243,284.50x = 387,410.50 × 387,410.50
4. Step 4: Simplify right side
   243,284.50x = 150,086,895,510.25
5. Step 5: Solve for x
   x = 150,086,895,510.25/243,284.50
6. Step 6: Final answer
   x = 616,919.27