Finding the Fourth Proportional to 8,456.10, 12,668.34 and 7,078.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.10 : 12,668.34 = 7,078.29 : x
2. Step 2: Convert to fraction form
   8,456.10/12,668.34 = 7,078.29/x
3. Step 3: Cross multiply
   8,456.10x = 12,668.34 × 7,078.29
4. Step 4: Simplify right side
   8,456.10x = 89,670,184.34
5. Step 5: Solve for x
   x = 89,670,184.34/8,456.10
6. Step 6: Final answer
   x = 10,604.20