Finding the Third Proportional to 12,939.75 and 17,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.75 : 17,815.50 = 17,815.50 : x
2. Step 2: Convert to fraction form
   12,939.75/17,815.50 = 17,815.50/x
3. Step 3: Cross multiply
   12,939.75x = 17,815.50 × 17,815.50
4. Step 4: Simplify right side
   12,939.75x = 317,392,040.25
5. Step 5: Solve for x
   x = 317,392,040.25/12,939.75
6. Step 6: Final answer
   x = 24,528.45