Finding the Third Proportional to 328.88 and 667.88

Step by Step Solution

1. Step 1: Write the proportion equation
   328.88 : 667.88 = 667.88 : x
2. Step 2: Convert to fraction form
   328.88/667.88 = 667.88/x
3. Step 3: Cross multiply
   328.88x = 667.88 × 667.88
4. Step 4: Simplify right side
   328.88x = 446,057.02
5. Step 5: Solve for x
   x = 446,057.02/328.88
6. Step 6: Final answer
   x = 1,356.31