Finding the Fourth Proportional to 6,641.99, 9,964.37 and 3,521.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,641.99 : 9,964.37 = 3,521.15 : x
2. Step 2: Convert to fraction form
   6,641.99/9,964.37 = 3,521.15/x
3. Step 3: Cross multiply
   6,641.99x = 9,964.37 × 3,521.15
4. Step 4: Simplify right side
   6,641.99x = 35,085,989.94
5. Step 5: Solve for x
   x = 35,085,989.94/6,641.99
6. Step 6: Final answer
   x = 5,282.45