Finding the Fourth Proportional to 111.20, 153.48 and 104.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.20 : 153.48 = 104.72 : x
2. Step 2: Convert to fraction form
   111.20/153.48 = 104.72/x
3. Step 3: Cross multiply
   111.20x = 153.48 × 104.72
4. Step 4: Simplify right side
   111.20x = 16,072.43
5. Step 5: Solve for x
   x = 16,072.43/111.20
6. Step 6: Final answer
   x = 144.54