Finding the Fourth Proportional to 8,498.79, 12,756.53 and 5,579.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,498.79 : 12,756.53 = 5,579.15 : x
2. Step 2: Convert to fraction form
   8,498.79/12,756.53 = 5,579.15/x
3. Step 3: Cross multiply
   8,498.79x = 12,756.53 × 5,579.15
4. Step 4: Simplify right side
   8,498.79x = 71,170,544.51
5. Step 5: Solve for x
   x = 71,170,544.51/8,498.79
6. Step 6: Final answer
   x = 8,374.20