Finding the Fourth Proportional to 21,757.16, 30,024.72 and 12,804.68

Step by Step Solution

1. Step 1: Write the proportion equation
   21,757.16 : 30,024.72 = 12,804.68 : x
2. Step 2: Convert to fraction form
   21,757.16/30,024.72 = 12,804.68/x
3. Step 3: Cross multiply
   21,757.16x = 30,024.72 × 12,804.68
4. Step 4: Simplify right side
   21,757.16x = 384,456,931.69
5. Step 5: Solve for x
   x = 384,456,931.69/21,757.16
6. Step 6: Final answer
   x = 17,670.36