Finding the Third Proportional to 12,939.75 and 18,319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.75 : 18,319.50 = 18,319.50 : x
2. Step 2: Convert to fraction form
   12,939.75/18,319.50 = 18,319.50/x
3. Step 3: Cross multiply
   12,939.75x = 18,319.50 × 18,319.50
4. Step 4: Simplify right side
   12,939.75x = 335,604,080.25
5. Step 5: Solve for x
   x = 335,604,080.25/12,939.75
6. Step 6: Final answer
   x = 25,935.90