Finding the Fourth Proportional to 3,315.30, 4,540.71 and 3,123.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,315.30 : 4,540.71 = 3,123.60 : x
2. Step 2: Convert to fraction form
   3,315.30/4,540.71 = 3,123.60/x
3. Step 3: Cross multiply
   3,315.30x = 4,540.71 × 3,123.60
4. Step 4: Simplify right side
   3,315.30x = 14,183,338.87
5. Step 5: Solve for x
   x = 14,183,338.87/3,315.30
6. Step 6: Final answer
   x = 4,278.15