Finding the Third Proportional to 131,728.78 and 287,324.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131,728.78 : 287,324.72 = 287,324.72 : x
2. Step 2: Convert to fraction form
   131,728.78/287,324.72 = 287,324.72/x
3. Step 3: Cross multiply
   131,728.78x = 287,324.72 × 287,324.72
4. Step 4: Simplify right side
   131,728.78x = 82,555,494,004.77
5. Step 5: Solve for x
   x = 82,555,494,004.77/131,728.78
6. Step 6: Final answer
   x = 626,708.10