Finding the Fourth Proportional to 9,039.69, 12,479.30 and 5,684.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,039.69 : 12,479.30 = 5,684.35 : x
2. Step 2: Convert to fraction form
   9,039.69/12,479.30 = 5,684.35/x
3. Step 3: Cross multiply
   9,039.69x = 12,479.30 × 5,684.35
4. Step 4: Simplify right side
   9,039.69x = 70,936,708.96
5. Step 5: Solve for x
   x = 70,936,708.96/9,039.69
6. Step 6: Final answer
   x = 7,847.25