Finding the Third Proportional to 328,515 and 431,356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,515 : 431,356.50 = 431,356.50 : x
2. Step 2: Convert to fraction form
   328,515/431,356.50 = 431,356.50/x
3. Step 3: Cross multiply
   328,515x = 431,356.50 × 431,356.50
4. Step 4: Simplify right side
   328,515x = 186,068,430,092.25
5. Step 5: Solve for x
   x = 186,068,430,092.25/328,515
6. Step 6: Final answer
   x = 566,392.49