Finding the Fourth Proportional to 86.52, 118.72 and 83.28

Step by Step Solution

1. Step 1: Write the proportion equation
   86.52 : 118.72 = 83.28 : x
2. Step 2: Convert to fraction form
   86.52/118.72 = 83.28/x
3. Step 3: Cross multiply
   86.52x = 118.72 × 83.28
4. Step 4: Simplify right side
   86.52x = 9,887.00
5. Step 5: Solve for x
   x = 9,887.00/86.52
6. Step 6: Final answer
   x = 114.27