Finding the Fourth Proportional to 111.49, 153.83 and 76.55

Step by Step Solution

1. Step 1: Write the proportion equation
   111.49 : 153.83 = 76.55 : x
2. Step 2: Convert to fraction form
   111.49/153.83 = 76.55/x
3. Step 3: Cross multiply
   111.49x = 153.83 × 76.55
4. Step 4: Simplify right side
   111.49x = 11,775.11
5. Step 5: Solve for x
   x = 11,775.11/111.49
6. Step 6: Final answer
   x = 105.62