Finding the Fourth Proportional to 111.30, 152.55 and 109.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111.30 : 152.55 = 109.78 : x
2. Step 2: Convert to fraction form
   111.30/152.55 = 109.78/x
3. Step 3: Cross multiply
   111.30x = 152.55 × 109.78
4. Step 4: Simplify right side
   111.30x = 16,746.94
5. Step 5: Solve for x
   x = 16,746.94/111.30
6. Step 6: Final answer
   x = 150.47