Finding the Third Proportional to 144.28 and 308.81

Step by Step Solution

1. Step 1: Write the proportion equation
   144.28 : 308.81 = 308.81 : x
2. Step 2: Convert to fraction form
   144.28/308.81 = 308.81/x
3. Step 3: Cross multiply
   144.28x = 308.81 × 308.81
4. Step 4: Simplify right side
   144.28x = 95,365.16
5. Step 5: Solve for x
   x = 95,365.16/144.28
6. Step 6: Final answer
   x = 660.97