Finding the Fourth Proportional to 86.88, 130.50 and 82.28

Step by Step Solution

1. Step 1: Write the proportion equation
   86.88 : 130.50 = 82.28 : x
2. Step 2: Convert to fraction form
   86.88/130.50 = 82.28/x
3. Step 3: Cross multiply
   86.88x = 130.50 × 82.28
4. Step 4: Simplify right side
   86.88x = 10,736.89
5. Step 5: Solve for x
   x = 10,736.89/86.88
6. Step 6: Final answer
   x = 123.58