Finding the Fourth Proportional to 111.04, 166.68 and 100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.04 : 166.68 = 100.72 : x
2. Step 2: Convert to fraction form
   111.04/166.68 = 100.72/x
3. Step 3: Cross multiply
   111.04x = 166.68 × 100.72
4. Step 4: Simplify right side
   111.04x = 16,788.01
5. Step 5: Solve for x
   x = 16,788.01/111.04
6. Step 6: Final answer
   x = 151.19