Finding the Fourth Proportional to 3,939.56, 5,891.90 and 3,503.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.56 : 5,891.90 = 3,503.87 : x
2. Step 2: Convert to fraction form
   3,939.56/5,891.90 = 3,503.87/x
3. Step 3: Cross multiply
   3,939.56x = 5,891.90 × 3,503.87
4. Step 4: Simplify right side
   3,939.56x = 20,644,404.67
5. Step 5: Solve for x
   x = 20,644,404.67/3,939.56
6. Step 6: Final answer
   x = 5,240.29