Finding the Fourth Proportional to 11,317.32, 16,969.50 and 10,665

Step by Step Solution

1. Step 1: Write the proportion equation
   11,317.32 : 16,969.50 = 10,665 : x
2. Step 2: Convert to fraction form
   11,317.32/16,969.50 = 10,665/x
3. Step 3: Cross multiply
   11,317.32x = 16,969.50 × 10,665
4. Step 4: Simplify right side
   11,317.32x = 180,979,717.50
5. Step 5: Solve for x
   x = 180,979,717.50/11,317.32
6. Step 6: Final answer
   x = 15,991.39