Finding the Fourth Proportional to 2,821.52, 3,865.22 and 2,789.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,821.52 : 3,865.22 = 2,789.92 : x
2. Step 2: Convert to fraction form
   2,821.52/3,865.22 = 2,789.92/x
3. Step 3: Cross multiply
   2,821.52x = 3,865.22 × 2,789.92
4. Step 4: Simplify right side
   2,821.52x = 10,783,654.58
5. Step 5: Solve for x
   x = 10,783,654.58/2,821.52
6. Step 6: Final answer
   x = 3,821.93