Finding the Fourth Proportional to 28.69, 42.86 and 22.23

Step by Step Solution

1. Step 1: Write the proportion equation
   28.69 : 42.86 = 22.23 : x
2. Step 2: Convert to fraction form
   28.69/42.86 = 22.23/x
3. Step 3: Cross multiply
   28.69x = 42.86 × 22.23
4. Step 4: Simplify right side
   28.69x = 952.83
5. Step 5: Solve for x
   x = 952.83/28.69
6. Step 6: Final answer
   x = 33.21