Finding the Fourth Proportional to 3,909.90, 5,399.82 and 2,656.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.90 : 5,399.82 = 2,656.56 : x
2. Step 2: Convert to fraction form
   3,909.90/5,399.82 = 2,656.56/x
3. Step 3: Cross multiply
   3,909.90x = 5,399.82 × 2,656.56
4. Step 4: Simplify right side
   3,909.90x = 14,344,945.82
5. Step 5: Solve for x
   x = 14,344,945.82/3,909.90
6. Step 6: Final answer
   x = 3,668.88