Finding the Fourth Proportional to 89.16, 134.42 and 89.16

Step by Step Solution

1. Step 1: Write the proportion equation
   89.16 : 134.42 = 89.16 : x
2. Step 2: Convert to fraction form
   89.16/134.42 = 89.16/x
3. Step 3: Cross multiply
   89.16x = 134.42 × 89.16
4. Step 4: Simplify right side
   89.16x = 11,984.89
5. Step 5: Solve for x
   x = 11,984.89/89.16
6. Step 6: Final answer
   x = 134.42