Finding the Fourth Proportional to 6,857.80, 10,287.42 and 2,239.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,857.80 : 10,287.42 = 2,239.72 : x
2. Step 2: Convert to fraction form
   6,857.80/10,287.42 = 2,239.72/x
3. Step 3: Cross multiply
   6,857.80x = 10,287.42 × 2,239.72
4. Step 4: Simplify right side
   6,857.80x = 23,040,940.32
5. Step 5: Solve for x
   x = 23,040,940.32/6,857.80
6. Step 6: Final answer
   x = 3,359.82