Finding the Fourth Proportional to 86.56, 118.69 and 85.52

Step by Step Solution

1. Step 1: Write the proportion equation
   86.56 : 118.69 = 85.52 : x
2. Step 2: Convert to fraction form
   86.56/118.69 = 85.52/x
3. Step 3: Cross multiply
   86.56x = 118.69 × 85.52
4. Step 4: Simplify right side
   86.56x = 10,150.45
5. Step 5: Solve for x
   x = 10,150.45/86.56
6. Step 6: Final answer
   x = 117.27