Finding the Third Proportional to 20.69 and 39.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20.69 : 39.50 = 39.50 : x
2. Step 2: Convert to fraction form
   20.69/39.50 = 39.50/x
3. Step 3: Cross multiply
   20.69x = 39.50 × 39.50
4. Step 4: Simplify right side
   20.69x = 1,560.25
5. Step 5: Solve for x
   x = 1,560.25/20.69
6. Step 6: Final answer
   x = 75.42