Finding the Third Proportional to 20,386 and 28,707.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,386 : 28,707.50 = 28,707.50 : x
2. Step 2: Convert to fraction form
   20,386/28,707.50 = 28,707.50/x
3. Step 3: Cross multiply
   20,386x = 28,707.50 × 28,707.50
4. Step 4: Simplify right side
   20,386x = 824,120,556.25
5. Step 5: Solve for x
   x = 824,120,556.25/20,386
6. Step 6: Final answer
   x = 40,425.81