Finding the Fourth Proportional to 112.39, 168.38 and 100.71

Step by Step Solution

1. Step 1: Write the proportion equation
   112.39 : 168.38 = 100.71 : x
2. Step 2: Convert to fraction form
   112.39/168.38 = 100.71/x
3. Step 3: Cross multiply
   112.39x = 168.38 × 100.71
4. Step 4: Simplify right side
   112.39x = 16,957.05
5. Step 5: Solve for x
   x = 16,957.05/112.39
6. Step 6: Final answer
   x = 150.88