Finding the Fourth Proportional to 6,520.59, 8,991.78 and 5,579.49

Step by Step Solution

1. Step 1: Write the proportion equation
   6,520.59 : 8,991.78 = 5,579.49 : x
2. Step 2: Convert to fraction form
   6,520.59/8,991.78 = 5,579.49/x
3. Step 3: Cross multiply
   6,520.59x = 8,991.78 × 5,579.49
4. Step 4: Simplify right side
   6,520.59x = 50,169,546.59
5. Step 5: Solve for x
   x = 50,169,546.59/6,520.59
6. Step 6: Final answer
   x = 7,694.02