Finding the Fourth Proportional to 21,826.88, 30,119.67 and 12,872.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.88 : 30,119.67 = 12,872.33 : x
2. Step 2: Convert to fraction form
   21,826.88/30,119.67 = 12,872.33/x
3. Step 3: Cross multiply
   21,826.88x = 30,119.67 × 12,872.33
4. Step 4: Simplify right side
   21,826.88x = 387,710,331.73
5. Step 5: Solve for x
   x = 387,710,331.73/21,826.88
6. Step 6: Final answer
   x = 17,762.98