Finding the Fourth Proportional to 111.41, 166.99 and 72.96

Step by Step Solution

1. Step 1: Write the proportion equation
   111.41 : 166.99 = 72.96 : x
2. Step 2: Convert to fraction form
   111.41/166.99 = 72.96/x
3. Step 3: Cross multiply
   111.41x = 166.99 × 72.96
4. Step 4: Simplify right side
   111.41x = 12,183.59
5. Step 5: Solve for x
   x = 12,183.59/111.41
6. Step 6: Final answer
   x = 109.36