Finding the Fourth Proportional to 21,824.85, 30,116.82 and 12,871.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,824.85 : 30,116.82 = 12,871.92 : x
2. Step 2: Convert to fraction form
   21,824.85/30,116.82 = 12,871.92/x
3. Step 3: Cross multiply
   21,824.85x = 30,116.82 × 12,871.92
4. Step 4: Simplify right side
   21,824.85x = 387,661,297.69
5. Step 5: Solve for x
   x = 387,661,297.69/21,824.85
6. Step 6: Final answer
   x = 17,762.38