Finding the Third Proportional to 221,881.78 and 329,401.69

Step by Step Solution

1. Step 1: Write the proportion equation
   221,881.78 : 329,401.69 = 329,401.69 : x
2. Step 2: Convert to fraction form
   221,881.78/329,401.69 = 329,401.69/x
3. Step 3: Cross multiply
   221,881.78x = 329,401.69 × 329,401.69
4. Step 4: Simplify right side
   221,881.78x = 108,505,471,727.85
5. Step 5: Solve for x
   x = 108,505,471,727.85/221,881.78
6. Step 6: Final answer
   x = 489,023.80