Finding the Third Proportional to 21.88 and 39.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21.88 : 39.50 = 39.50 : x
2. Step 2: Convert to fraction form
   21.88/39.50 = 39.50/x
3. Step 3: Cross multiply
   21.88x = 39.50 × 39.50
4. Step 4: Simplify right side
   21.88x = 1,560.25
5. Step 5: Solve for x
   x = 1,560.25/21.88
6. Step 6: Final answer
   x = 71.33