Finding the Fourth Proportional to 8,611.98, 12,885.36 and 5,103.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,611.98 : 12,885.36 = 5,103.87 : x
2. Step 2: Convert to fraction form
   8,611.98/12,885.36 = 5,103.87/x
3. Step 3: Cross multiply
   8,611.98x = 12,885.36 × 5,103.87
4. Step 4: Simplify right side
   8,611.98x = 65,765,221.48
5. Step 5: Solve for x
   x = 65,765,221.48/8,611.98
6. Step 6: Final answer
   x = 7,636.48