Finding the Third Proportional to 239,257.50 and 521,979

Step by Step Solution

1. Step 1: Write the proportion equation
   239,257.50 : 521,979 = 521,979 : x
2. Step 2: Convert to fraction form
   239,257.50/521,979 = 521,979/x
3. Step 3: Cross multiply
   239,257.50x = 521,979 × 521,979
4. Step 4: Simplify right side
   239,257.50x = 272,462,076,441
5. Step 5: Solve for x
   x = 272,462,076,441/239,257.50
6. Step 6: Final answer
   x = 1,138,781.76