Finding the Third Proportional to 271,431 and 438,817.50

Step by Step Solution

1. Step 1: Write the proportion equation
   271,431 : 438,817.50 = 438,817.50 : x
2. Step 2: Convert to fraction form
   271,431/438,817.50 = 438,817.50/x
3. Step 3: Cross multiply
   271,431x = 438,817.50 × 438,817.50
4. Step 4: Simplify right side
   271,431x = 192,560,798,306.25
5. Step 5: Solve for x
   x = 192,560,798,306.25/271,431
6. Step 6: Final answer
   x = 709,428.17