Finding the Fourth Proportional to 111.86, 154.15 and 104.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.86 : 154.15 = 104.72 : x
2. Step 2: Convert to fraction form
   111.86/154.15 = 104.72/x
3. Step 3: Cross multiply
   111.86x = 154.15 × 104.72
4. Step 4: Simplify right side
   111.86x = 16,142.06
5. Step 5: Solve for x
   x = 16,142.06/111.86
6. Step 6: Final answer
   x = 144.31