Finding the Fourth Proportional to 6,411.98, 9,614.09 and 3,121.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,411.98 : 9,614.09 = 3,121.78 : x
2. Step 2: Convert to fraction form
   6,411.98/9,614.09 = 3,121.78/x
3. Step 3: Cross multiply
   6,411.98x = 9,614.09 × 3,121.78
4. Step 4: Simplify right side
   6,411.98x = 30,013,073.88
5. Step 5: Solve for x
   x = 30,013,073.88/6,411.98
6. Step 6: Final answer
   x = 4,680.78