Finding the Fourth Proportional to 3,978.48, 5,490.96 and 3,314.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.48 : 5,490.96 = 3,314.28 : x
2. Step 2: Convert to fraction form
   3,978.48/5,490.96 = 3,314.28/x
3. Step 3: Cross multiply
   3,978.48x = 5,490.96 × 3,314.28
4. Step 4: Simplify right side
   3,978.48x = 18,198,578.91
5. Step 5: Solve for x
   x = 18,198,578.91/3,978.48
6. Step 6: Final answer
   x = 4,574.25