Finding the Fourth Proportional to 82.14, 123.18 and 28.02

Step by Step Solution

1. Step 1: Write the proportion equation
   82.14 : 123.18 = 28.02 : x
2. Step 2: Convert to fraction form
   82.14/123.18 = 28.02/x
3. Step 3: Cross multiply
   82.14x = 123.18 × 28.02
4. Step 4: Simplify right side
   82.14x = 3,451.50
5. Step 5: Solve for x
   x = 3,451.50/82.14
6. Step 6: Final answer
   x = 42.02