Finding the Fourth Proportional to 86.02, 118.52 and 83.50

Step by Step Solution

1. Step 1: Write the proportion equation
   86.02 : 118.52 = 83.50 : x
2. Step 2: Convert to fraction form
   86.02/118.52 = 83.50/x
3. Step 3: Cross multiply
   86.02x = 118.52 × 83.50
4. Step 4: Simplify right side
   86.02x = 9,896.42
5. Step 5: Solve for x
   x = 9,896.42/86.02
6. Step 6: Final answer
   x = 115.05