Finding the Fourth Proportional to 11,815.47, 16,303.28 and 8,679.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.47 : 16,303.28 = 8,679.15 : x
2. Step 2: Convert to fraction form
   11,815.47/16,303.28 = 8,679.15/x
3. Step 3: Cross multiply
   11,815.47x = 16,303.28 × 8,679.15
4. Step 4: Simplify right side
   11,815.47x = 141,498,569.22
5. Step 5: Solve for x
   x = 141,498,569.22/11,815.47
6. Step 6: Final answer
   x = 11,975.70