Finding the Fourth Proportional to 3,989.94, 5,508.36 and 3,103.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.94 : 5,508.36 = 3,103.80 : x
2. Step 2: Convert to fraction form
   3,989.94/5,508.36 = 3,103.80/x
3. Step 3: Cross multiply
   3,989.94x = 5,508.36 × 3,103.80
4. Step 4: Simplify right side
   3,989.94x = 17,096,847.77
5. Step 5: Solve for x
   x = 17,096,847.77/3,989.94
6. Step 6: Final answer
   x = 4,284.99