Finding the Fourth Proportional to 102.74, 141.71 and 71.17

Step by Step Solution

1. Step 1: Write the proportion equation
   102.74 : 141.71 = 71.17 : x
2. Step 2: Convert to fraction form
   102.74/141.71 = 71.17/x
3. Step 3: Cross multiply
   102.74x = 141.71 × 71.17
4. Step 4: Simplify right side
   102.74x = 10,085.46
5. Step 5: Solve for x
   x = 10,085.46/102.74
6. Step 6: Final answer
   x = 98.17