Finding the Third Proportional to 111.81 and 240.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.81 : 240.69 = 240.69 : x
2. Step 2: Convert to fraction form
   111.81/240.69 = 240.69/x
3. Step 3: Cross multiply
   111.81x = 240.69 × 240.69
4. Step 4: Simplify right side
   111.81x = 57,930.47
5. Step 5: Solve for x
   x = 57,930.47/111.81
6. Step 6: Final answer
   x = 518.10