Finding the Third Proportional to 247.78 and 529.31

Step by Step Solution

1. Step 1: Write the proportion equation
   247.78 : 529.31 = 529.31 : x
2. Step 2: Convert to fraction form
   247.78/529.31 = 529.31/x
3. Step 3: Cross multiply
   247.78x = 529.31 × 529.31
4. Step 4: Simplify right side
   247.78x = 280,171.72
5. Step 5: Solve for x
   x = 280,171.72/247.78
6. Step 6: Final answer
   x = 1,130.72