Finding the Third Proportional to 148.78 and 255.94

Step by Step Solution

1. Step 1: Write the proportion equation
   148.78 : 255.94 = 255.94 : x
2. Step 2: Convert to fraction form
   148.78/255.94 = 255.94/x
3. Step 3: Cross multiply
   148.78x = 255.94 × 255.94
4. Step 4: Simplify right side
   148.78x = 65,504.00
5. Step 5: Solve for x
   x = 65,504.00/148.78
6. Step 6: Final answer
   x = 440.27