Finding the Third Proportional to 328.69 and 718.31

Step by Step Solution

1. Step 1: Write the proportion equation
   328.69 : 718.31 = 718.31 : x
2. Step 2: Convert to fraction form
   328.69/718.31 = 718.31/x
3. Step 3: Cross multiply
   328.69x = 718.31 × 718.31
4. Step 4: Simplify right side
   328.69x = 515,972.85
5. Step 5: Solve for x
   x = 515,972.85/328.69
6. Step 6: Final answer
   x = 1,569.80