Finding the Fourth Proportional to 111.98, 154.56 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.56 = 72.69 : x
2. Step 2: Convert to fraction form
   111.98/154.56 = 72.69/x
3. Step 3: Cross multiply
   111.98x = 154.56 × 72.69
4. Step 4: Simplify right side
   111.98x = 11,234.97
5. Step 5: Solve for x
   x = 11,234.97/111.98
6. Step 6: Final answer
   x = 100.33