Finding the Fourth Proportional to 18,216.47, 25,138.82 and 10,661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   18,216.47 : 25,138.82 = 10,661.33 : x
2. Step 2: Convert to fraction form
   18,216.47/25,138.82 = 10,661.33/x
3. Step 3: Cross multiply
   18,216.47x = 25,138.82 × 10,661.33
4. Step 4: Simplify right side
   18,216.47x = 268,013,076.83
5. Step 5: Solve for x
   x = 268,013,076.83/18,216.47
6. Step 6: Final answer
   x = 14,712.68