Finding the Fourth Proportional to 2,518.91, 3,476.20 and 1,399.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.91 : 3,476.20 = 1,399.85 : x
2. Step 2: Convert to fraction form
   2,518.91/3,476.20 = 1,399.85/x
3. Step 3: Cross multiply
   2,518.91x = 3,476.20 × 1,399.85
4. Step 4: Simplify right side
   2,518.91x = 4,866,158.57
5. Step 5: Solve for x
   x = 4,866,158.57/2,518.91
6. Step 6: Final answer
   x = 1,931.85