Finding the Fourth Proportional to 8,456.56, 12,684.71 and 2,909.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.56 : 12,684.71 = 2,909.96 : x
2. Step 2: Convert to fraction form
   8,456.56/12,684.71 = 2,909.96/x
3. Step 3: Cross multiply
   8,456.56x = 12,684.71 × 2,909.96
4. Step 4: Simplify right side
   8,456.56x = 36,911,920.74
5. Step 5: Solve for x
   x = 36,911,920.74/8,456.56
6. Step 6: Final answer
   x = 4,364.89