Finding the Fourth Proportional to 83.28, 123.36 and 82.32

Step by Step Solution

1. Step 1: Write the proportion equation
   83.28 : 123.36 = 82.32 : x
2. Step 2: Convert to fraction form
   83.28/123.36 = 82.32/x
3. Step 3: Cross multiply
   83.28x = 123.36 × 82.32
4. Step 4: Simplify right side
   83.28x = 10,155.00
5. Step 5: Solve for x
   x = 10,155.00/83.28
6. Step 6: Final answer
   x = 121.94