Finding the Fourth Proportional to 8,559.72, 12,820.90 and 5,262.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,559.72 : 12,820.90 = 5,262.82 : x
2. Step 2: Convert to fraction form
   8,559.72/12,820.90 = 5,262.82/x
3. Step 3: Cross multiply
   8,559.72x = 12,820.90 × 5,262.82
4. Step 4: Simplify right side
   8,559.72x = 67,474,088.94
5. Step 5: Solve for x
   x = 67,474,088.94/8,559.72
6. Step 6: Final answer
   x = 7,882.74