Finding the Fourth Proportional to 111.98, 154.50 and 76.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.50 = 76.55 : x
2. Step 2: Convert to fraction form
   111.98/154.50 = 76.55/x
3. Step 3: Cross multiply
   111.98x = 154.50 × 76.55
4. Step 4: Simplify right side
   111.98x = 11,826.20
5. Step 5: Solve for x
   x = 11,826.20/111.98
6. Step 6: Final answer
   x = 105.61