Finding the Fourth Proportional to 111.74, 153.88 and 111.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.74 : 153.88 = 111.42 : x
2. Step 2: Convert to fraction form
   111.74/153.88 = 111.42/x
3. Step 3: Cross multiply
   111.74x = 153.88 × 111.42
4. Step 4: Simplify right side
   111.74x = 17,145.31
5. Step 5: Solve for x
   x = 17,145.31/111.74
6. Step 6: Final answer
   x = 153.44