Finding the Fourth Proportional to 21,745.34, 30,005.77 and 12,789.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,745.34 : 30,005.77 = 12,789.58 : x
2. Step 2: Convert to fraction form
   21,745.34/30,005.77 = 12,789.58/x
3. Step 3: Cross multiply
   21,745.34x = 30,005.77 × 12,789.58
4. Step 4: Simplify right side
   21,745.34x = 383,760,981.90
5. Step 5: Solve for x
   x = 383,760,981.90/21,745.34
6. Step 6: Final answer
   x = 17,647.96