Finding the Fourth Proportional to 82.37, 123.57 and 28.28

Step by Step Solution

1. Step 1: Write the proportion equation
   82.37 : 123.57 = 28.28 : x
2. Step 2: Convert to fraction form
   82.37/123.57 = 28.28/x
3. Step 3: Cross multiply
   82.37x = 123.57 × 28.28
4. Step 4: Simplify right side
   82.37x = 3,494.42
5. Step 5: Solve for x
   x = 3,494.42/82.37
6. Step 6: Final answer
   x = 42.42