Finding the Third Proportional to 243,282.50 and 387,408

Step by Step Solution

1. Step 1: Write the proportion equation
   243,282.50 : 387,408 = 387,408 : x
2. Step 2: Convert to fraction form
   243,282.50/387,408 = 387,408/x
3. Step 3: Cross multiply
   243,282.50x = 387,408 × 387,408
4. Step 4: Simplify right side
   243,282.50x = 150,084,958,464
5. Step 5: Solve for x
   x = 150,084,958,464/243,282.50
6. Step 6: Final answer
   x = 616,916.38