Finding the Fourth Proportional to 115.36, 158.72 and 111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   115.36 : 158.72 = 111.76 : x
2. Step 2: Convert to fraction form
   115.36/158.72 = 111.76/x
3. Step 3: Cross multiply
   115.36x = 158.72 × 111.76
4. Step 4: Simplify right side
   115.36x = 17,738.55
5. Step 5: Solve for x
   x = 17,738.55/115.36
6. Step 6: Final answer
   x = 153.77