Finding the Fourth Proportional to 111.52, 153.57 and 88.12

Step by Step Solution

1. Step 1: Write the proportion equation
   111.52 : 153.57 = 88.12 : x
2. Step 2: Convert to fraction form
   111.52/153.57 = 88.12/x
3. Step 3: Cross multiply
   111.52x = 153.57 × 88.12
4. Step 4: Simplify right side
   111.52x = 13,532.59
5. Step 5: Solve for x
   x = 13,532.59/111.52
6. Step 6: Final answer
   x = 121.35