Finding the Fourth Proportional to 11,809.91, 16,287.98 and 8,619.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,809.91 : 16,287.98 = 8,619.62 : x
2. Step 2: Convert to fraction form
   11,809.91/16,287.98 = 8,619.62/x
3. Step 3: Cross multiply
   11,809.91x = 16,287.98 × 8,619.62
4. Step 4: Simplify right side
   11,809.91x = 140,396,073.63
5. Step 5: Solve for x
   x = 140,396,073.63/11,809.91
6. Step 6: Final answer
   x = 11,887.99