Finding the Fourth Proportional to 8,759.98, 12,086.51 and 5,220.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,759.98 : 12,086.51 = 5,220.69 : x
2. Step 2: Convert to fraction form
   8,759.98/12,086.51 = 5,220.69/x
3. Step 3: Cross multiply
   8,759.98x = 12,086.51 × 5,220.69
4. Step 4: Simplify right side
   8,759.98x = 63,099,921.89
5. Step 5: Solve for x
   x = 63,099,921.89/8,759.98
6. Step 6: Final answer
   x = 7,203.20