Finding the Third Proportional to 112.78 and 169.31

Step by Step Solution

1. Step 1: Write the proportion equation
   112.78 : 169.31 = 169.31 : x
2. Step 2: Convert to fraction form
   112.78/169.31 = 169.31/x
3. Step 3: Cross multiply
   112.78x = 169.31 × 169.31
4. Step 4: Simplify right side
   112.78x = 28,666.72
5. Step 5: Solve for x
   x = 28,666.72/112.78
6. Step 6: Final answer
   x = 254.18