Finding the Fourth Proportional to 21,801.61, 30,087.21 and 12,849.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,801.61 : 30,087.21 = 12,849.49 : x
2. Step 2: Convert to fraction form
   21,801.61/30,087.21 = 12,849.49/x
3. Step 3: Cross multiply
   21,801.61x = 30,087.21 × 12,849.49
4. Step 4: Simplify right side
   21,801.61x = 386,605,304.02
5. Step 5: Solve for x
   x = 386,605,304.02/21,801.61
6. Step 6: Final answer
   x = 17,732.88