Finding the Third Proportional to 111.38 and 272.81

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 272.81 = 272.81 : x
2. Step 2: Convert to fraction form
   111.38/272.81 = 272.81/x
3. Step 3: Cross multiply
   111.38x = 272.81 × 272.81
4. Step 4: Simplify right side
   111.38x = 74,426.66
5. Step 5: Solve for x
   x = 74,426.66/111.38
6. Step 6: Final answer
   x = 668.25