Finding the Fourth Proportional to 6,520.91, 9,782.57 and 2,139.62

Step by Step Solution

1. Step 1: Write the proportion equation
   6,520.91 : 9,782.57 = 2,139.62 : x
2. Step 2: Convert to fraction form
   6,520.91/9,782.57 = 2,139.62/x
3. Step 3: Cross multiply
   6,520.91x = 9,782.57 × 2,139.62
4. Step 4: Simplify right side
   6,520.91x = 20,930,938.86
5. Step 5: Solve for x
   x = 20,930,938.86/6,520.91
6. Step 6: Final answer
   x = 3,209.82