Finding the Third Proportional to 340.88 and 456.89

Step by Step Solution

1. Step 1: Write the proportion equation
   340.88 : 456.89 = 456.89 : x
2. Step 2: Convert to fraction form
   340.88/456.89 = 456.89/x
3. Step 3: Cross multiply
   340.88x = 456.89 × 456.89
4. Step 4: Simplify right side
   340.88x = 208,749.04
5. Step 5: Solve for x
   x = 208,749.04/340.88
6. Step 6: Final answer
   x = 612.39