Finding the Fourth Proportional to 8,585.30, 12,880.38 and 3,321.92

Step by Step Solution

1. Step 1: Write the proportion equation
   8,585.30 : 12,880.38 = 3,321.92 : x
2. Step 2: Convert to fraction form
   8,585.30/12,880.38 = 3,321.92/x
3. Step 3: Cross multiply
   8,585.30x = 12,880.38 × 3,321.92
4. Step 4: Simplify right side
   8,585.30x = 42,787,591.93
5. Step 5: Solve for x
   x = 42,787,591.93/8,585.30
6. Step 6: Final answer
   x = 4,983.82