Finding the Third Proportional to 328.31 and 672.38

Step by Step Solution

1. Step 1: Write the proportion equation
   328.31 : 672.38 = 672.38 : x
2. Step 2: Convert to fraction form
   328.31/672.38 = 672.38/x
3. Step 3: Cross multiply
   328.31x = 672.38 × 672.38
4. Step 4: Simplify right side
   328.31x = 452,088.14
5. Step 5: Solve for x
   x = 452,088.14/328.31
6. Step 6: Final answer
   x = 1,377.01