Finding the Fourth Proportional to 91.05, 136.01 and 89.34

Step by Step Solution

1. Step 1: Write the proportion equation
   91.05 : 136.01 = 89.34 : x
2. Step 2: Convert to fraction form
   91.05/136.01 = 89.34/x
3. Step 3: Cross multiply
   91.05x = 136.01 × 89.34
4. Step 4: Simplify right side
   91.05x = 12,151.13
5. Step 5: Solve for x
   x = 12,151.13/91.05
6. Step 6: Final answer
   x = 133.46