Finding the Fourth Proportional to 9,685.69, 14,508.82 and 8,878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,685.69 : 14,508.82 = 8,878.38 : x
2. Step 2: Convert to fraction form
   9,685.69/14,508.82 = 8,878.38/x
3. Step 3: Cross multiply
   9,685.69x = 14,508.82 × 8,878.38
4. Step 4: Simplify right side
   9,685.69x = 128,814,778.40
5. Step 5: Solve for x
   x = 128,814,778.40/9,685.69
6. Step 6: Final answer
   x = 13,299.49