Finding the Fourth Proportional to 89.53, 122.72 and 88.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.53 : 122.72 = 88.12 : x
2. Step 2: Convert to fraction form
   89.53/122.72 = 88.12/x
3. Step 3: Cross multiply
   89.53x = 122.72 × 88.12
4. Step 4: Simplify right side
   89.53x = 10,814.09
5. Step 5: Solve for x
   x = 10,814.09/89.53
6. Step 6: Final answer
   x = 120.79