Finding the Fourth Proportional to 111.11, 153.32 and 83.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.11 : 153.32 = 83.42 : x
2. Step 2: Convert to fraction form
   111.11/153.32 = 83.42/x
3. Step 3: Cross multiply
   111.11x = 153.32 × 83.42
4. Step 4: Simplify right side
   111.11x = 12,789.92
5. Step 5: Solve for x
   x = 12,789.92/111.11
6. Step 6: Final answer
   x = 115.11