Finding the Fourth Proportional to 8,979.45, 12,389.83 and 5,440.61

Step by Step Solution

1. Step 1: Write the proportion equation
   8,979.45 : 12,389.83 = 5,440.61 : x
2. Step 2: Convert to fraction form
   8,979.45/12,389.83 = 5,440.61/x
3. Step 3: Cross multiply
   8,979.45x = 12,389.83 × 5,440.61
4. Step 4: Simplify right side
   8,979.45x = 67,408,233.00
5. Step 5: Solve for x
   x = 67,408,233.00/8,979.45
6. Step 6: Final answer
   x = 7,506.94