Finding the Fourth Proportional to 5,728.78, 7,901.22 and 3,839.73

Step by Step Solution

1. Step 1: Write the proportion equation
   5,728.78 : 7,901.22 = 3,839.73 : x
2. Step 2: Convert to fraction form
   5,728.78/7,901.22 = 3,839.73/x
3. Step 3: Cross multiply
   5,728.78x = 7,901.22 × 3,839.73
4. Step 4: Simplify right side
   5,728.78x = 30,338,551.47
5. Step 5: Solve for x
   x = 30,338,551.47/5,728.78
6. Step 6: Final answer
   x = 5,295.81