Finding the Fourth Proportional to 6,128.78, 8,456.41 and 3,609.98

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.78 : 8,456.41 = 3,609.98 : x
2. Step 2: Convert to fraction form
   6,128.78/8,456.41 = 3,609.98/x
3. Step 3: Cross multiply
   6,128.78x = 8,456.41 × 3,609.98
4. Step 4: Simplify right side
   6,128.78x = 30,527,470.97
5. Step 5: Solve for x
   x = 30,527,470.97/6,128.78
6. Step 6: Final answer
   x = 4,981.00