Finding the Fourth Proportional to 21,789.05, 30,067.98 and 12,359.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.05 : 30,067.98 = 12,359.39 : x
2. Step 2: Convert to fraction form
   21,789.05/30,067.98 = 12,359.39/x
3. Step 3: Cross multiply
   21,789.05x = 30,067.98 × 12,359.39
4. Step 4: Simplify right side
   21,789.05x = 371,621,891.33
5. Step 5: Solve for x
   x = 371,621,891.33/21,789.05
6. Step 6: Final answer
   x = 17,055.44