Finding the Third Proportional to 144.38 and 317.55

Step by Step Solution

1. Step 1: Write the proportion equation
   144.38 : 317.55 = 317.55 : x
2. Step 2: Convert to fraction form
   144.38/317.55 = 317.55/x
3. Step 3: Cross multiply
   144.38x = 317.55 × 317.55
4. Step 4: Simplify right side
   144.38x = 100,840.98
5. Step 5: Solve for x
   x = 100,840.98/144.38
6. Step 6: Final answer
   x = 698.47