Finding the Fourth Proportional to 21,821.97, 30,096.05 and 13,423.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.97 : 30,096.05 = 13,423.89 : x
2. Step 2: Convert to fraction form
   21,821.97/30,096.05 = 13,423.89/x
3. Step 3: Cross multiply
   21,821.97x = 30,096.05 × 13,423.89
4. Step 4: Simplify right side
   21,821.97x = 404,005,997.52
5. Step 5: Solve for x
   x = 404,005,997.52/21,821.97
6. Step 6: Final answer
   x = 18,513.73