Finding the Third Proportional to 220.22 and 329.72

Step by Step Solution

1. Step 1: Write the proportion equation
   220.22 : 329.72 = 329.72 : x
2. Step 2: Convert to fraction form
   220.22/329.72 = 329.72/x
3. Step 3: Cross multiply
   220.22x = 329.72 × 329.72
4. Step 4: Simplify right side
   220.22x = 108,714.45
5. Step 5: Solve for x
   x = 108,714.45/220.22
6. Step 6: Final answer
   x = 493.67