Finding the Fourth Proportional to 3,908.91, 5,394.59 and 2,580.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,908.91 : 5,394.59 = 2,580.31 : x
2. Step 2: Convert to fraction form
   3,908.91/5,394.59 = 2,580.31/x
3. Step 3: Cross multiply
   3,908.91x = 5,394.59 × 2,580.31
4. Step 4: Simplify right side
   3,908.91x = 13,919,714.52
5. Step 5: Solve for x
   x = 13,919,714.52/3,908.91
6. Step 6: Final answer
   x = 3,561.02