Finding the Third Proportional to 111,144.66 and 239,785.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111,144.66 : 239,785.31 = 239,785.31 : x
2. Step 2: Convert to fraction form
   111,144.66/239,785.31 = 239,785.31/x
3. Step 3: Cross multiply
   111,144.66x = 239,785.31 × 239,785.31
4. Step 4: Simplify right side
   111,144.66x = 57,496,996,090.72
5. Step 5: Solve for x
   x = 57,496,996,090.72/111,144.66
6. Step 6: Final answer
   x = 517,316.78