Finding the Fourth Proportional to 11,821.53, 16,320.25 and 8,631.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,821.53 : 16,320.25 = 8,631.62 : x
2. Step 2: Convert to fraction form
   11,821.53/16,320.25 = 8,631.62/x
3. Step 3: Cross multiply
   11,821.53x = 16,320.25 × 8,631.62
4. Step 4: Simplify right side
   11,821.53x = 140,870,196.31
5. Step 5: Solve for x
   x = 140,870,196.31/11,821.53
6. Step 6: Final answer
   x = 11,916.41