Finding the Third Proportional to 13,339.69 and 20,391.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,339.69 : 20,391.75 = 20,391.75 : x
2. Step 2: Convert to fraction form
   13,339.69/20,391.75 = 20,391.75/x
3. Step 3: Cross multiply
   13,339.69x = 20,391.75 × 20,391.75
4. Step 4: Simplify right side
   13,339.69x = 415,823,468.06
5. Step 5: Solve for x
   x = 415,823,468.06/13,339.69
6. Step 6: Final answer
   x = 31,171.90