Finding the Fourth Proportional to 90.91, 136.10 and 88.59

Step by Step Solution

1. Step 1: Write the proportion equation
   90.91 : 136.10 = 88.59 : x
2. Step 2: Convert to fraction form
   90.91/136.10 = 88.59/x
3. Step 3: Cross multiply
   90.91x = 136.10 × 88.59
4. Step 4: Simplify right side
   90.91x = 12,057.10
5. Step 5: Solve for x
   x = 12,057.10/90.91
6. Step 6: Final answer
   x = 132.63