Finding the Fourth Proportional to 8,579.59, 12,871.81 and 5,072.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,579.59 : 12,871.81 = 5,072.69 : x
2. Step 2: Convert to fraction form
   8,579.59/12,871.81 = 5,072.69/x
3. Step 3: Cross multiply
   8,579.59x = 12,871.81 × 5,072.69
4. Step 4: Simplify right side
   8,579.59x = 65,294,740.39
5. Step 5: Solve for x
   x = 65,294,740.39/8,579.59
6. Step 6: Final answer
   x = 7,610.48