Finding the Fourth Proportional to 12,738.72, 19,087.84 and 8,563.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,738.72 : 19,087.84 = 8,563.36 : x
2. Step 2: Convert to fraction form
   12,738.72/19,087.84 = 8,563.36/x
3. Step 3: Cross multiply
   12,738.72x = 19,087.84 × 8,563.36
4. Step 4: Simplify right side
   12,738.72x = 163,456,045.54
5. Step 5: Solve for x
   x = 163,456,045.54/12,738.72
6. Step 6: Final answer
   x = 12,831.43