Finding the Fourth Proportional to 11,665.52, 16,103.88 and 8,315.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.52 : 16,103.88 = 8,315.28 : x
2. Step 2: Convert to fraction form
   11,665.52/16,103.88 = 8,315.28/x
3. Step 3: Cross multiply
   11,665.52x = 16,103.88 × 8,315.28
4. Step 4: Simplify right side
   11,665.52x = 133,908,271.29
5. Step 5: Solve for x
   x = 133,908,271.29/11,665.52
6. Step 6: Final answer
   x = 11,478.98