Finding the Fourth Proportional to 111.04, 152.89 and 108.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.04 : 152.89 = 108.78 : x
2. Step 2: Convert to fraction form
   111.04/152.89 = 108.78/x
3. Step 3: Cross multiply
   111.04x = 152.89 × 108.78
4. Step 4: Simplify right side
   111.04x = 16,631.37
5. Step 5: Solve for x
   x = 16,631.37/111.04
6. Step 6: Final answer
   x = 149.78