Finding the Fourth Proportional to 8,456.40, 12,685.21 and 2,613.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.40 : 12,685.21 = 2,613.47 : x
2. Step 2: Convert to fraction form
   8,456.40/12,685.21 = 2,613.47/x
3. Step 3: Cross multiply
   8,456.40x = 12,685.21 × 2,613.47
4. Step 4: Simplify right side
   8,456.40x = 33,152,345.82
5. Step 5: Solve for x
   x = 33,152,345.82/8,456.40
6. Step 6: Final answer
   x = 3,920.39