Finding the Fourth Proportional to 82.17, 123.27 and 28.05

Step by Step Solution

1. Step 1: Write the proportion equation
   82.17 : 123.27 = 28.05 : x
2. Step 2: Convert to fraction form
   82.17/123.27 = 28.05/x
3. Step 3: Cross multiply
   82.17x = 123.27 × 28.05
4. Step 4: Simplify right side
   82.17x = 3,457.72
5. Step 5: Solve for x
   x = 3,457.72/82.17
6. Step 6: Final answer
   x = 42.08