Finding the Fourth Proportional to 111.96, 168.60 and 100.68

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 168.60 = 100.68 : x
2. Step 2: Convert to fraction form
   111.96/168.60 = 100.68/x
3. Step 3: Cross multiply
   111.96x = 168.60 × 100.68
4. Step 4: Simplify right side
   111.96x = 16,974.65
5. Step 5: Solve for x
   x = 16,974.65/111.96
6. Step 6: Final answer
   x = 151.61