Finding the Fourth Proportional to 21,822.34, 30,113.49 and 12,870.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,822.34 : 30,113.49 = 12,870.22 : x
2. Step 2: Convert to fraction form
   21,822.34/30,113.49 = 12,870.22/x
3. Step 3: Cross multiply
   21,822.34x = 30,113.49 × 12,870.22
4. Step 4: Simplify right side
   21,822.34x = 387,567,241.27
5. Step 5: Solve for x
   x = 387,567,241.27/21,822.34
6. Step 6: Final answer
   x = 17,760.11