Finding the Fourth Proportional to 112.56, 168.52 and 86.93

Step by Step Solution

1. Step 1: Write the proportion equation
   112.56 : 168.52 = 86.93 : x
2. Step 2: Convert to fraction form
   112.56/168.52 = 86.93/x
3. Step 3: Cross multiply
   112.56x = 168.52 × 86.93
4. Step 4: Simplify right side
   112.56x = 14,650.52
5. Step 5: Solve for x
   x = 14,650.52/112.56
6. Step 6: Final answer
   x = 130.15