Finding the Fourth Proportional to 111.05, 153.32 and 87.83

Step by Step Solution

1. Step 1: Write the proportion equation
   111.05 : 153.32 = 87.83 : x
2. Step 2: Convert to fraction form
   111.05/153.32 = 87.83/x
3. Step 3: Cross multiply
   111.05x = 153.32 × 87.83
4. Step 4: Simplify right side
   111.05x = 13,464.89
5. Step 5: Solve for x
   x = 13,464.89/111.05
6. Step 6: Final answer
   x = 121.26