Finding the Fourth Proportional to 111.29, 153.56 and 88.03

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 153.56 = 88.03 : x
2. Step 2: Convert to fraction form
   111.29/153.56 = 88.03/x
3. Step 3: Cross multiply
   111.29x = 153.56 × 88.03
4. Step 4: Simplify right side
   111.29x = 13,518.38
5. Step 5: Solve for x
   x = 13,518.38/111.29
6. Step 6: Final answer
   x = 121.47