Finding the Third Proportional to 39.94 and 69.89

Step by Step Solution

1. Step 1: Write the proportion equation
   39.94 : 69.89 = 69.89 : x
2. Step 2: Convert to fraction form
   39.94/69.89 = 69.89/x
3. Step 3: Cross multiply
   39.94x = 69.89 × 69.89
4. Step 4: Simplify right side
   39.94x = 4,884.70
5. Step 5: Solve for x
   x = 4,884.70/39.94
6. Step 6: Final answer
   x = 122.31