Finding the Third Proportional to 144.38 and 318.56

Step by Step Solution

1. Step 1: Write the proportion equation
   144.38 : 318.56 = 318.56 : x
2. Step 2: Convert to fraction form
   144.38/318.56 = 318.56/x
3. Step 3: Cross multiply
   144.38x = 318.56 × 318.56
4. Step 4: Simplify right side
   144.38x = 101,482.07
5. Step 5: Solve for x
   x = 101,482.07/144.38
6. Step 6: Final answer
   x = 702.91