Finding the Third Proportional to 243,303 and 387,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   243,303 : 387,436.50 = 387,436.50 : x
2. Step 2: Convert to fraction form
   243,303/387,436.50 = 387,436.50/x
3. Step 3: Cross multiply
   243,303x = 387,436.50 × 387,436.50
4. Step 4: Simplify right side
   243,303x = 150,107,041,532.25
5. Step 5: Solve for x
   x = 150,107,041,532.25/243,303
6. Step 6: Final answer
   x = 616,955.16