Finding the Third Proportional to 122.63 and 255.38

Step by Step Solution

1. Step 1: Write the proportion equation
   122.63 : 255.38 = 255.38 : x
2. Step 2: Convert to fraction form
   122.63/255.38 = 255.38/x
3. Step 3: Cross multiply
   122.63x = 255.38 × 255.38
4. Step 4: Simplify right side
   122.63x = 65,216.39
5. Step 5: Solve for x
   x = 65,216.39/122.63
6. Step 6: Final answer
   x = 531.84