Finding the Third Proportional to 217,447.50 and 329,178

Step by Step Solution

1. Step 1: Write the proportion equation
   217,447.50 : 329,178 = 329,178 : x
2. Step 2: Convert to fraction form
   217,447.50/329,178 = 329,178/x
3. Step 3: Cross multiply
   217,447.50x = 329,178 × 329,178
4. Step 4: Simplify right side
   217,447.50x = 108,358,155,684
5. Step 5: Solve for x
   x = 108,358,155,684/217,447.50
6. Step 6: Final answer
   x = 498,318.70