Finding the Fourth Proportional to 21,759.94, 30,021.33 and 12,804.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,759.94 : 30,021.33 = 12,804.58 : x
2. Step 2: Convert to fraction form
   21,759.94/30,021.33 = 12,804.58/x
3. Step 3: Cross multiply
   21,759.94x = 30,021.33 × 12,804.58
4. Step 4: Simplify right side
   21,759.94x = 384,410,521.69
5. Step 5: Solve for x
   x = 384,410,521.69/21,759.94
6. Step 6: Final answer
   x = 17,665.97