Finding the Fourth Proportional to 16,721.82, 25,086.51 and 8,405.82

Step by Step Solution

1. Step 1: Write the proportion equation
   16,721.82 : 25,086.51 = 8,405.82 : x
2. Step 2: Convert to fraction form
   16,721.82/25,086.51 = 8,405.82/x
3. Step 3: Cross multiply
   16,721.82x = 25,086.51 × 8,405.82
4. Step 4: Simplify right side
   16,721.82x = 210,872,687.49
5. Step 5: Solve for x
   x = 210,872,687.49/16,721.82
6. Step 6: Final answer
   x = 12,610.63