Finding the Fourth Proportional to 21,738.22, 30,003.15 and 12,309.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,738.22 : 30,003.15 = 12,309.82 : x
2. Step 2: Convert to fraction form
   21,738.22/30,003.15 = 12,309.82/x
3. Step 3: Cross multiply
   21,738.22x = 30,003.15 × 12,309.82
4. Step 4: Simplify right side
   21,738.22x = 369,333,375.93
5. Step 5: Solve for x
   x = 369,333,375.93/21,738.22
6. Step 6: Final answer
   x = 16,990.05