Finding the Fourth Proportional to 9,723.40, 14,613.90 and 8,456.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,723.40 : 14,613.90 = 8,456.20 : x
2. Step 2: Convert to fraction form
   9,723.40/14,613.90 = 8,456.20/x
3. Step 3: Cross multiply
   9,723.40x = 14,613.90 × 8,456.20
4. Step 4: Simplify right side
   9,723.40x = 123,578,061.18
5. Step 5: Solve for x
   x = 123,578,061.18/9,723.40
6. Step 6: Final answer
   x = 12,709.35