Finding the Fourth Proportional to 3,909.46, 5,868.31 and 3,821.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,909.46 : 5,868.31 = 3,821.31 : x
2. Step 2: Convert to fraction form
   3,909.46/5,868.31 = 3,821.31/x
3. Step 3: Cross multiply
   3,909.46x = 5,868.31 × 3,821.31
4. Step 4: Simplify right side
   3,909.46x = 22,424,631.69
5. Step 5: Solve for x
   x = 22,424,631.69/3,909.46
6. Step 6: Final answer
   x = 5,735.99