Finding the Third Proportional to 318.38 and 404.06

Step by Step Solution

1. Step 1: Write the proportion equation
   318.38 : 404.06 = 404.06 : x
2. Step 2: Convert to fraction form
   318.38/404.06 = 404.06/x
3. Step 3: Cross multiply
   318.38x = 404.06 × 404.06
4. Step 4: Simplify right side
   318.38x = 163,266.50
5. Step 5: Solve for x
   x = 163,266.50/318.38
6. Step 6: Final answer
   x = 512.81