Finding the Fourth Proportional to 21,789.72, 30,072.33 and 12,360

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.72 : 30,072.33 = 12,360 : x
2. Step 2: Convert to fraction form
   21,789.72/30,072.33 = 12,360/x
3. Step 3: Cross multiply
   21,789.72x = 30,072.33 × 12,360
4. Step 4: Simplify right side
   21,789.72x = 371,693,998.80
5. Step 5: Solve for x
   x = 371,693,998.80/21,789.72
6. Step 6: Final answer
   x = 17,058.23