Finding the Fourth Proportional to 8,520.82, 12,772.59 and 5,399.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,520.82 : 12,772.59 = 5,399.86 : x
2. Step 2: Convert to fraction form
   8,520.82/12,772.59 = 5,399.86/x
3. Step 3: Cross multiply
   8,520.82x = 12,772.59 × 5,399.86
4. Step 4: Simplify right side
   8,520.82x = 68,970,197.84
5. Step 5: Solve for x
   x = 68,970,197.84/8,520.82
6. Step 6: Final answer
   x = 8,094.31