Finding the Fourth Proportional to 8,611.89, 12,919.98 and 2,455.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,611.89 : 12,919.98 = 2,455.89 : x
2. Step 2: Convert to fraction form
   8,611.89/12,919.98 = 2,455.89/x
3. Step 3: Cross multiply
   8,611.89x = 12,919.98 × 2,455.89
4. Step 4: Simplify right side
   8,611.89x = 31,730,049.68
5. Step 5: Solve for x
   x = 31,730,049.68/8,611.89
6. Step 6: Final answer
   x = 3,684.45