Finding the Fourth Proportional to 111.94, 154.15 and 109.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.15 = 109.55 : x
2. Step 2: Convert to fraction form
   111.94/154.15 = 109.55/x
3. Step 3: Cross multiply
   111.94x = 154.15 × 109.55
4. Step 4: Simplify right side
   111.94x = 16,887.86
5. Step 5: Solve for x
   x = 16,887.86/111.94
6. Step 6: Final answer
   x = 150.87