Finding the Fourth Proportional to 112.86, 168.08 and 105.34

Step by Step Solution

1. Step 1: Write the proportion equation
   112.86 : 168.08 = 105.34 : x
2. Step 2: Convert to fraction form
   112.86/168.08 = 105.34/x
3. Step 3: Cross multiply
   112.86x = 168.08 × 105.34
4. Step 4: Simplify right side
   112.86x = 17,705.55
5. Step 5: Solve for x
   x = 17,705.55/112.86
6. Step 6: Final answer
   x = 156.89