Finding the Fourth Proportional to 16,415, 24,601.72 and 10,489.58

Step by Step Solution

1. Step 1: Write the proportion equation
   16,415 : 24,601.72 = 10,489.58 : x
2. Step 2: Convert to fraction form
   16,415/24,601.72 = 10,489.58/x
3. Step 3: Cross multiply
   16,415x = 24,601.72 × 10,489.58
4. Step 4: Simplify right side
   16,415x = 258,061,710.08
5. Step 5: Solve for x
   x = 258,061,710.08/16,415
6. Step 6: Final answer
   x = 15,721.09