Finding the Fourth Proportional to 86.33, 128.73 and 82.73

Step by Step Solution

1. Step 1: Write the proportion equation
   86.33 : 128.73 = 82.73 : x
2. Step 2: Convert to fraction form
   86.33/128.73 = 82.73/x
3. Step 3: Cross multiply
   86.33x = 128.73 × 82.73
4. Step 4: Simplify right side
   86.33x = 10,650.00
5. Step 5: Solve for x
   x = 10,650.00/86.33
6. Step 6: Final answer
   x = 123.36