Finding the Fourth Proportional to 2,518.15, 3,475.17 and 1,399.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.15 : 3,475.17 = 1,399.09 : x
2. Step 2: Convert to fraction form
   2,518.15/3,475.17 = 1,399.09/x
3. Step 3: Cross multiply
   2,518.15x = 3,475.17 × 1,399.09
4. Step 4: Simplify right side
   2,518.15x = 4,862,068.60
5. Step 5: Solve for x
   x = 4,862,068.60/2,518.15
6. Step 6: Final answer
   x = 1,930.81