Finding the Fourth Proportional to 82.11, 123.17 and 28.00

Step by Step Solution

1. Step 1: Write the proportion equation
   82.11 : 123.17 = 28.00 : x
2. Step 2: Convert to fraction form
   82.11/123.17 = 28.00/x
3. Step 3: Cross multiply
   82.11x = 123.17 × 28.00
4. Step 4: Simplify right side
   82.11x = 3,449.02
5. Step 5: Solve for x
   x = 3,449.02/82.11
6. Step 6: Final answer
   x = 42.01