Finding the Fourth Proportional to 89.28, 123.30 and 88.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89.28 : 123.30 = 88.56 : x
2. Step 2: Convert to fraction form
   89.28/123.30 = 88.56/x
3. Step 3: Cross multiply
   89.28x = 123.30 × 88.56
4. Step 4: Simplify right side
   89.28x = 10,919.45
5. Step 5: Solve for x
   x = 10,919.45/89.28
6. Step 6: Final answer
   x = 122.31