Finding the Third Proportional to 172,816.50 and 357,940.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172,816.50 : 357,940.50 = 357,940.50 : x
2. Step 2: Convert to fraction form
   172,816.50/357,940.50 = 357,940.50/x
3. Step 3: Cross multiply
   172,816.50x = 357,940.50 × 357,940.50
4. Step 4: Simplify right side
   172,816.50x = 128,121,401,540.25
5. Step 5: Solve for x
   x = 128,121,401,540.25/172,816.50
6. Step 6: Final answer
   x = 741,372.51