Finding the Third Proportional to 218,389.50 and 329,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   218,389.50 : 329,123.25 = 329,123.25 : x
2. Step 2: Convert to fraction form
   218,389.50/329,123.25 = 329,123.25/x
3. Step 3: Cross multiply
   218,389.50x = 329,123.25 × 329,123.25
4. Step 4: Simplify right side
   218,389.50x = 108,322,113,690.56
5. Step 5: Solve for x
   x = 108,322,113,690.56/218,389.50
6. Step 6: Final answer
   x = 496,004.22