Finding the Fourth Proportional to 82.22, 123.33 and 28.12

Step by Step Solution

1. Step 1: Write the proportion equation
   82.22 : 123.33 = 28.12 : x
2. Step 2: Convert to fraction form
   82.22/123.33 = 28.12/x
3. Step 3: Cross multiply
   82.22x = 123.33 × 28.12
4. Step 4: Simplify right side
   82.22x = 3,467.73
5. Step 5: Solve for x
   x = 3,467.73/82.22
6. Step 6: Final answer
   x = 42.18