Finding the Fourth Proportional to 91.17, 136 and 88.69

Step by Step Solution

1. Step 1: Write the proportion equation
   91.17 : 136 = 88.69 : x
2. Step 2: Convert to fraction form
   91.17/136 = 88.69/x
3. Step 3: Cross multiply
   91.17x = 136 × 88.69
4. Step 4: Simplify right side
   91.17x = 12,061.16
5. Step 5: Solve for x
   x = 12,061.16/91.17
6. Step 6: Final answer
   x = 132.30