Finding the Fourth Proportional to 111.16, 166.58 and 72.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.16 : 166.58 = 72.62 : x
2. Step 2: Convert to fraction form
   111.16/166.58 = 72.62/x
3. Step 3: Cross multiply
   111.16x = 166.58 × 72.62
4. Step 4: Simplify right side
   111.16x = 12,097.04
5. Step 5: Solve for x
   x = 12,097.04/111.16
6. Step 6: Final answer
   x = 108.83