Finding the Fourth Proportional to 82.28, 113.42 and 71.82

Step by Step Solution

1. Step 1: Write the proportion equation
   82.28 : 113.42 = 71.82 : x
2. Step 2: Convert to fraction form
   82.28/113.42 = 71.82/x
3. Step 3: Cross multiply
   82.28x = 113.42 × 71.82
4. Step 4: Simplify right side
   82.28x = 8,146.00
5. Step 5: Solve for x
   x = 8,146.00/82.28
6. Step 6: Final answer
   x = 99.00