Finding the Fourth Proportional to 69.92, 104.89 and 28.79

Step by Step Solution

1. Step 1: Write the proportion equation
   69.92 : 104.89 = 28.79 : x
2. Step 2: Convert to fraction form
   69.92/104.89 = 28.79/x
3. Step 3: Cross multiply
   69.92x = 104.89 × 28.79
4. Step 4: Simplify right side
   69.92x = 3,020.22
5. Step 5: Solve for x
   x = 3,020.22/69.92
6. Step 6: Final answer
   x = 43.20