Finding the Third Proportional to 218,395 and 329,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,395 : 329,131.50 = 329,131.50 : x
2. Step 2: Convert to fraction form
   218,395/329,131.50 = 329,131.50/x
3. Step 3: Cross multiply
   218,395x = 329,131.50 × 329,131.50
4. Step 4: Simplify right side
   218,395x = 108,327,544,292.25
5. Step 5: Solve for x
   x = 108,327,544,292.25/218,395
6. Step 6: Final answer
   x = 496,016.60