Finding the Fourth Proportional to 112.49, 168.84 and 105.89

Step by Step Solution

1. Step 1: Write the proportion equation
   112.49 : 168.84 = 105.89 : x
2. Step 2: Convert to fraction form
   112.49/168.84 = 105.89/x
3. Step 3: Cross multiply
   112.49x = 168.84 × 105.89
4. Step 4: Simplify right side
   112.49x = 17,877.62
5. Step 5: Solve for x
   x = 17,877.62/112.49
6. Step 6: Final answer
   x = 158.93