Finding the Fourth Proportional to 2,518.49, 3,475.61 and 1,399.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.49 : 3,475.61 = 1,399.65 : x
2. Step 2: Convert to fraction form
   2,518.49/3,475.61 = 1,399.65/x
3. Step 3: Cross multiply
   2,518.49x = 3,475.61 × 1,399.65
4. Step 4: Simplify right side
   2,518.49x = 4,864,622.75
5. Step 5: Solve for x
   x = 4,864,622.75/2,518.49
6. Step 6: Final answer
   x = 1,931.56