Finding the Fourth Proportional to 16,986, 25,487.52 and 8,111.28

Step by Step Solution

1. Step 1: Write the proportion equation
   16,986 : 25,487.52 = 8,111.28 : x
2. Step 2: Convert to fraction form
   16,986/25,487.52 = 8,111.28/x
3. Step 3: Cross multiply
   16,986x = 25,487.52 × 8,111.28
4. Step 4: Simplify right side
   16,986x = 206,736,411.23
5. Step 5: Solve for x
   x = 206,736,411.23/16,986
6. Step 6: Final answer
   x = 12,170.99