Finding the Fourth Proportional to 112.38, 168.57 and 72.06

Step by Step Solution

1. Step 1: Write the proportion equation
   112.38 : 168.57 = 72.06 : x
2. Step 2: Convert to fraction form
   112.38/168.57 = 72.06/x
3. Step 3: Cross multiply
   112.38x = 168.57 × 72.06
4. Step 4: Simplify right side
   112.38x = 12,147.15
5. Step 5: Solve for x
   x = 12,147.15/112.38
6. Step 6: Final answer
   x = 108.09