Finding the Third Proportional to 115,890 and 240,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,890 : 240,661.50 = 240,661.50 : x
2. Step 2: Convert to fraction form
   115,890/240,661.50 = 240,661.50/x
3. Step 3: Cross multiply
   115,890x = 240,661.50 × 240,661.50
4. Step 4: Simplify right side
   115,890x = 57,917,957,582.25
5. Step 5: Solve for x
   x = 57,917,957,582.25/115,890
6. Step 6: Final answer
   x = 499,766.65