Finding the Third Proportional to 20,778 and 28,387.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,778 : 28,387.50 = 28,387.50 : x
2. Step 2: Convert to fraction form
   20,778/28,387.50 = 28,387.50/x
3. Step 3: Cross multiply
   20,778x = 28,387.50 × 28,387.50
4. Step 4: Simplify right side
   20,778x = 805,850,156.25
5. Step 5: Solve for x
   x = 805,850,156.25/20,778
6. Step 6: Final answer
   x = 38,783.82