Finding the Third Proportional to 20,387.75 and 31,509.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,387.75 : 31,509.50 = 31,509.50 : x
2. Step 2: Convert to fraction form
   20,387.75/31,509.50 = 31,509.50/x
3. Step 3: Cross multiply
   20,387.75x = 31,509.50 × 31,509.50
4. Step 4: Simplify right side
   20,387.75x = 992,848,590.25
5. Step 5: Solve for x
   x = 992,848,590.25/20,387.75
6. Step 6: Final answer
   x = 48,698.29