Finding the Fourth Proportional to 111.94, 154.77 and 103.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.77 = 103.78 : x
2. Step 2: Convert to fraction form
   111.94/154.77 = 103.78/x
3. Step 3: Cross multiply
   111.94x = 154.77 × 103.78
4. Step 4: Simplify right side
   111.94x = 16,062.03
5. Step 5: Solve for x
   x = 16,062.03/111.94
6. Step 6: Final answer
   x = 143.49