Finding the Fourth Proportional to 2,518.39, 3,474.85 and 1,399.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.39 : 3,474.85 = 1,399.10 : x
2. Step 2: Convert to fraction form
   2,518.39/3,474.85 = 1,399.10/x
3. Step 3: Cross multiply
   2,518.39x = 3,474.85 × 1,399.10
4. Step 4: Simplify right side
   2,518.39x = 4,861,654.16
5. Step 5: Solve for x
   x = 4,861,654.16/2,518.39
6. Step 6: Final answer
   x = 1,930.46