Finding the Fourth Proportional to 90.88, 136.14 and 89.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.88 : 136.14 = 89.05 : x
2. Step 2: Convert to fraction form
   90.88/136.14 = 89.05/x
3. Step 3: Cross multiply
   90.88x = 136.14 × 89.05
4. Step 4: Simplify right side
   90.88x = 12,123.27
5. Step 5: Solve for x
   x = 12,123.27/90.88
6. Step 6: Final answer
   x = 133.40