Finding the Fourth Proportional to 11,315.32, 16,966.50 and 10,663

Step by Step Solution

1. Step 1: Write the proportion equation
   11,315.32 : 16,966.50 = 10,663 : x
2. Step 2: Convert to fraction form
   11,315.32/16,966.50 = 10,663/x
3. Step 3: Cross multiply
   11,315.32x = 16,966.50 × 10,663
4. Step 4: Simplify right side
   11,315.32x = 180,913,789.50
5. Step 5: Solve for x
   x = 180,913,789.50/11,315.32
6. Step 6: Final answer
   x = 15,988.39