Finding the Third Proportional to 111.13 and 242.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.13 : 242.31 = 242.31 : x
2. Step 2: Convert to fraction form
   111.13/242.31 = 242.31/x
3. Step 3: Cross multiply
   111.13x = 242.31 × 242.31
4. Step 4: Simplify right side
   111.13x = 58,715.35
5. Step 5: Solve for x
   x = 58,715.35/111.13
6. Step 6: Final answer
   x = 528.37