Finding the Third Proportional to 18.38 and 38.91

Step by Step Solution

1. Step 1: Write the proportion equation
   18.38 : 38.91 = 38.91 : x
2. Step 2: Convert to fraction form
   18.38/38.91 = 38.91/x
3. Step 3: Cross multiply
   18.38x = 38.91 × 38.91
4. Step 4: Simplify right side
   18.38x = 1,513.70
5. Step 5: Solve for x
   x = 1,513.70/18.38
6. Step 6: Final answer
   x = 82.38