Finding the Fourth Proportional to 112.81, 168.89 and 105.59

Step by Step Solution

1. Step 1: Write the proportion equation
   112.81 : 168.89 = 105.59 : x
2. Step 2: Convert to fraction form
   112.81/168.89 = 105.59/x
3. Step 3: Cross multiply
   112.81x = 168.89 × 105.59
4. Step 4: Simplify right side
   112.81x = 17,832.99
5. Step 5: Solve for x
   x = 17,832.99/112.81
6. Step 6: Final answer
   x = 158.08