Finding the Fourth Proportional to 90.42, 134.69 and 88.59

Step by Step Solution

1. Step 1: Write the proportion equation
   90.42 : 134.69 = 88.59 : x
2. Step 2: Convert to fraction form
   90.42/134.69 = 88.59/x
3. Step 3: Cross multiply
   90.42x = 134.69 × 88.59
4. Step 4: Simplify right side
   90.42x = 11,932.50
5. Step 5: Solve for x
   x = 11,932.50/90.42
6. Step 6: Final answer
   x = 131.97