Finding the Fourth Proportional to 3,993.30, 5,511.48 and 2,315.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.30 : 5,511.48 = 2,315.78 : x
2. Step 2: Convert to fraction form
   3,993.30/5,511.48 = 2,315.78/x
3. Step 3: Cross multiply
   3,993.30x = 5,511.48 × 2,315.78
4. Step 4: Simplify right side
   3,993.30x = 12,763,375.15
5. Step 5: Solve for x
   x = 12,763,375.15/3,993.30
6. Step 6: Final answer
   x = 3,196.20