Finding the Fourth Proportional to 6,521.72, 9,782.51 and 2,139.12

Step by Step Solution

1. Step 1: Write the proportion equation
   6,521.72 : 9,782.51 = 2,139.12 : x
2. Step 2: Convert to fraction form
   6,521.72/9,782.51 = 2,139.12/x
3. Step 3: Cross multiply
   6,521.72x = 9,782.51 × 2,139.12
4. Step 4: Simplify right side
   6,521.72x = 20,925,952.10
5. Step 5: Solve for x
   x = 20,925,952.10/6,521.72
6. Step 6: Final answer
   x = 3,208.66