Finding the Fourth Proportional to 111.89, 154.42 and 74.49

Step by Step Solution

1. Step 1: Write the proportion equation
   111.89 : 154.42 = 74.49 : x
2. Step 2: Convert to fraction form
   111.89/154.42 = 74.49/x
3. Step 3: Cross multiply
   111.89x = 154.42 × 74.49
4. Step 4: Simplify right side
   111.89x = 11,502.75
5. Step 5: Solve for x
   x = 11,502.75/111.89
6. Step 6: Final answer
   x = 102.80