Finding the Third Proportional to 331,359 and 518,361.50

Step by Step Solution

1. Step 1: Write the proportion equation
   331,359 : 518,361.50 = 518,361.50 : x
2. Step 2: Convert to fraction form
   331,359/518,361.50 = 518,361.50/x
3. Step 3: Cross multiply
   331,359x = 518,361.50 × 518,361.50
4. Step 4: Simplify right side
   331,359x = 268,698,644,682.25
5. Step 5: Solve for x
   x = 268,698,644,682.25/331,359
6. Step 6: Final answer
   x = 810,898.89