Finding the Fourth Proportional to 91.56, 136.10 and 89.22

Step by Step Solution

1. Step 1: Write the proportion equation
   91.56 : 136.10 = 89.22 : x
2. Step 2: Convert to fraction form
   91.56/136.10 = 89.22/x
3. Step 3: Cross multiply
   91.56x = 136.10 × 89.22
4. Step 4: Simplify right side
   91.56x = 12,142.40
5. Step 5: Solve for x
   x = 12,142.40/91.56
6. Step 6: Final answer
   x = 132.62