Finding the Fourth Proportional to 8,607.43, 12,878.56 and 5,099.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,607.43 : 12,878.56 = 5,099.32 : x
2. Step 2: Convert to fraction form
   8,607.43/12,878.56 = 5,099.32/x
3. Step 3: Cross multiply
   8,607.43x = 12,878.56 × 5,099.32
4. Step 4: Simplify right side
   8,607.43x = 65,671,898.58
5. Step 5: Solve for x
   x = 65,671,898.58/8,607.43
6. Step 6: Final answer
   x = 7,629.68