Finding the Fourth Proportional to 82.10, 123.18 and 28.04

Step by Step Solution

1. Step 1: Write the proportion equation
   82.10 : 123.18 = 28.04 : x
2. Step 2: Convert to fraction form
   82.10/123.18 = 28.04/x
3. Step 3: Cross multiply
   82.10x = 123.18 × 28.04
4. Step 4: Simplify right side
   82.10x = 3,453.35
5. Step 5: Solve for x
   x = 3,453.35/82.10
6. Step 6: Final answer
   x = 42.07