Finding the Fourth Proportional to 6,456.40, 9,685.51 and 2,072.39

Step by Step Solution

1. Step 1: Write the proportion equation
   6,456.40 : 9,685.51 = 2,072.39 : x
2. Step 2: Convert to fraction form
   6,456.40/9,685.51 = 2,072.39/x
3. Step 3: Cross multiply
   6,456.40x = 9,685.51 × 2,072.39
4. Step 4: Simplify right side
   6,456.40x = 20,072,100.46
5. Step 5: Solve for x
   x = 20,072,100.46/6,456.40
6. Step 6: Final answer
   x = 3,108.87