Finding the Fourth Proportional to 88.16, 121.56 and 82.88

Step by Step Solution

1. Step 1: Write the proportion equation
   88.16 : 121.56 = 82.88 : x
2. Step 2: Convert to fraction form
   88.16/121.56 = 82.88/x
3. Step 3: Cross multiply
   88.16x = 121.56 × 82.88
4. Step 4: Simplify right side
   88.16x = 10,074.89
5. Step 5: Solve for x
   x = 10,074.89/88.16
6. Step 6: Final answer
   x = 114.28