Finding the Fourth Proportional to 3,976.78, 5,488.02 and 2,405.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,976.78 : 5,488.02 = 2,405.38 : x
2. Step 2: Convert to fraction form
   3,976.78/5,488.02 = 2,405.38/x
3. Step 3: Cross multiply
   3,976.78x = 5,488.02 × 2,405.38
4. Step 4: Simplify right side
   3,976.78x = 13,200,773.55
5. Step 5: Solve for x
   x = 13,200,773.55/3,976.78
6. Step 6: Final answer
   x = 3,319.46