Finding the Third Proportional to 120.38 and 255.09

Step by Step Solution

1. Step 1: Write the proportion equation
   120.38 : 255.09 = 255.09 : x
2. Step 2: Convert to fraction form
   120.38/255.09 = 255.09/x
3. Step 3: Cross multiply
   120.38x = 255.09 × 255.09
4. Step 4: Simplify right side
   120.38x = 65,072.82
5. Step 5: Solve for x
   x = 65,072.82/120.38
6. Step 6: Final answer
   x = 540.58