Finding the Fourth Proportional to 8,607.68, 12,878.94 and 5,099.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,607.68 : 12,878.94 = 5,099.57 : x
2. Step 2: Convert to fraction form
   8,607.68/12,878.94 = 5,099.57/x
3. Step 3: Cross multiply
   8,607.68x = 12,878.94 × 5,099.57
4. Step 4: Simplify right side
   8,607.68x = 65,677,056.06
5. Step 5: Solve for x
   x = 65,677,056.06/8,607.68
6. Step 6: Final answer
   x = 7,630.05