Finding the Fourth Proportional to 71.34, 106.92 and 54.17

Step by Step Solution

1. Step 1: Write the proportion equation
   71.34 : 106.92 = 54.17 : x
2. Step 2: Convert to fraction form
   71.34/106.92 = 54.17/x
3. Step 3: Cross multiply
   71.34x = 106.92 × 54.17
4. Step 4: Simplify right side
   71.34x = 5,791.59
5. Step 5: Solve for x
   x = 5,791.59/71.34
6. Step 6: Final answer
   x = 81.18