Finding the Third Proportional to 8,040.50 and 12,789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,040.50 : 12,789.50 = 12,789.50 : x
2. Step 2: Convert to fraction form
   8,040.50/12,789.50 = 12,789.50/x
3. Step 3: Cross multiply
   8,040.50x = 12,789.50 × 12,789.50
4. Step 4: Simplify right side
   8,040.50x = 163,571,310.25
5. Step 5: Solve for x
   x = 163,571,310.25/8,040.50
6. Step 6: Final answer
   x = 20,343.43