Finding the Fourth Proportional to 21,573.57, 29,771.46 and 12,013.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,573.57 : 29,771.46 = 12,013.58 : x
2. Step 2: Convert to fraction form
   21,573.57/29,771.46 = 12,013.58/x
3. Step 3: Cross multiply
   21,573.57x = 29,771.46 × 12,013.58
4. Step 4: Simplify right side
   21,573.57x = 357,661,857.07
5. Step 5: Solve for x
   x = 357,661,857.07/21,573.57
6. Step 6: Final answer
   x = 16,578.70