Finding the Fourth Proportional to 112.17, 168.22 and 105.96

Step by Step Solution

1. Step 1: Write the proportion equation
   112.17 : 168.22 = 105.96 : x
2. Step 2: Convert to fraction form
   112.17/168.22 = 105.96/x
3. Step 3: Cross multiply
   112.17x = 168.22 × 105.96
4. Step 4: Simplify right side
   112.17x = 17,824.59
5. Step 5: Solve for x
   x = 17,824.59/112.17
6. Step 6: Final answer
   x = 158.91