Finding the Fourth Proportional to 21,823.59, 30,115.22 and 12,871.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.59 : 30,115.22 = 12,871.47 : x
2. Step 2: Convert to fraction form
   21,823.59/30,115.22 = 12,871.47/x
3. Step 3: Cross multiply
   21,823.59x = 30,115.22 × 12,871.47
4. Step 4: Simplify right side
   21,823.59x = 387,627,086.42
5. Step 5: Solve for x
   x = 387,627,086.42/21,823.59
6. Step 6: Final answer
   x = 17,761.84