Finding the Third Proportional to 29.72 and 39.89

Step by Step Solution

1. Step 1: Write the proportion equation
   29.72 : 39.89 = 39.89 : x
2. Step 2: Convert to fraction form
   29.72/39.89 = 39.89/x
3. Step 3: Cross multiply
   29.72x = 39.89 × 39.89
4. Step 4: Simplify right side
   29.72x = 1,591.26
5. Step 5: Solve for x
   x = 1,591.26/29.72
6. Step 6: Final answer
   x = 53.54