Finding the Fourth Proportional to 21,824.34, 30,116.25 and 12,872.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,824.34 : 30,116.25 = 12,872.22 : x
2. Step 2: Convert to fraction form
   21,824.34/30,116.25 = 12,872.22/x
3. Step 3: Cross multiply
   21,824.34x = 30,116.25 × 12,872.22
4. Step 4: Simplify right side
   21,824.34x = 387,662,995.58
5. Step 5: Solve for x
   x = 387,662,995.58/21,824.34
6. Step 6: Final answer
   x = 17,762.87