Finding the Fourth Proportional to 111.78, 154.02 and 111.35

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 154.02 = 111.35 : x
2. Step 2: Convert to fraction form
   111.78/154.02 = 111.35/x
3. Step 3: Cross multiply
   111.78x = 154.02 × 111.35
4. Step 4: Simplify right side
   111.78x = 17,150.13
5. Step 5: Solve for x
   x = 17,150.13/111.78
6. Step 6: Final answer
   x = 153.43