Finding the Third Proportional to 15.61 and 34.17

Step by Step Solution

1. Step 1: Write the proportion equation
   15.61 : 34.17 = 34.17 : x
2. Step 2: Convert to fraction form
   15.61/34.17 = 34.17/x
3. Step 3: Cross multiply
   15.61x = 34.17 × 34.17
4. Step 4: Simplify right side
   15.61x = 1,167.72
5. Step 5: Solve for x
   x = 1,167.72/15.61
6. Step 6: Final answer
   x = 74.81