Finding the Fourth Proportional to 3,989.91, 5,509.31 and 3,569.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.91 : 5,509.31 = 3,569.52 : x
2. Step 2: Convert to fraction form
   3,989.91/5,509.31 = 3,569.52/x
3. Step 3: Cross multiply
   3,989.91x = 5,509.31 × 3,569.52
4. Step 4: Simplify right side
   3,989.91x = 19,665,574.38
5. Step 5: Solve for x
   x = 19,665,574.38/3,989.91
6. Step 6: Final answer
   x = 4,928.83