Finding the Fourth Proportional to 8,608.94, 12,910.22 and 5,099.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,608.94 : 12,910.22 = 5,099.72 : x
2. Step 2: Convert to fraction form
   8,608.94/12,910.22 = 5,099.72/x
3. Step 3: Cross multiply
   8,608.94x = 12,910.22 × 5,099.72
4. Step 4: Simplify right side
   8,608.94x = 65,838,507.14
5. Step 5: Solve for x
   x = 65,838,507.14/8,608.94
6. Step 6: Final answer
   x = 7,647.69