Finding the Fourth Proportional to 82.16, 123.16 and 28.02

Step by Step Solution

1. Step 1: Write the proportion equation
   82.16 : 123.16 = 28.02 : x
2. Step 2: Convert to fraction form
   82.16/123.16 = 28.02/x
3. Step 3: Cross multiply
   82.16x = 123.16 × 28.02
4. Step 4: Simplify right side
   82.16x = 3,450.57
5. Step 5: Solve for x
   x = 3,450.57/82.16
6. Step 6: Final answer
   x = 42.00