Finding the Fourth Proportional to 6,261.69, 8,640.84 and 3,609.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,261.69 : 8,640.84 = 3,609.15 : x
2. Step 2: Convert to fraction form
   6,261.69/8,640.84 = 3,609.15/x
3. Step 3: Cross multiply
   6,261.69x = 8,640.84 × 3,609.15
4. Step 4: Simplify right side
   6,261.69x = 31,186,087.69
5. Step 5: Solve for x
   x = 31,186,087.69/6,261.69
6. Step 6: Final answer
   x = 4,980.46