Finding the Fourth Proportional to 21,795.57, 30,072.98 and 12,843.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,795.57 : 30,072.98 = 12,843.91 : x
2. Step 2: Convert to fraction form
   21,795.57/30,072.98 = 12,843.91/x
3. Step 3: Cross multiply
   21,795.57x = 30,072.98 × 12,843.91
4. Step 4: Simplify right side
   21,795.57x = 386,254,509.15
5. Step 5: Solve for x
   x = 386,254,509.15/21,795.57
6. Step 6: Final answer
   x = 17,721.70