Finding the Third Proportional to 218,956.50 and 329,406

Step by Step Solution

1. Step 1: Write the proportion equation
   218,956.50 : 329,406 = 329,406 : x
2. Step 2: Convert to fraction form
   218,956.50/329,406 = 329,406/x
3. Step 3: Cross multiply
   218,956.50x = 329,406 × 329,406
4. Step 4: Simplify right side
   218,956.50x = 108,508,312,836
5. Step 5: Solve for x
   x = 108,508,312,836/218,956.50
6. Step 6: Final answer
   x = 495,570.18