Finding the Fourth Proportional to 13,872.72, 19,139.64 and 8,568.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,872.72 : 19,139.64 = 8,568.72 : x
2. Step 2: Convert to fraction form
   13,872.72/19,139.64 = 8,568.72/x
3. Step 3: Cross multiply
   13,872.72x = 19,139.64 × 8,568.72
4. Step 4: Simplify right side
   13,872.72x = 164,002,216.06
5. Step 5: Solve for x
   x = 164,002,216.06/13,872.72
6. Step 6: Final answer
   x = 11,821.92