Finding the Fourth Proportional to 102.72, 141.69 and 71.59

Step by Step Solution

1. Step 1: Write the proportion equation
   102.72 : 141.69 = 71.59 : x
2. Step 2: Convert to fraction form
   102.72/141.69 = 71.59/x
3. Step 3: Cross multiply
   102.72x = 141.69 × 71.59
4. Step 4: Simplify right side
   102.72x = 10,143.59
5. Step 5: Solve for x
   x = 10,143.59/102.72
6. Step 6: Final answer
   x = 98.75