Finding the Fourth Proportional to 2,518.91, 3,475.87 and 1,399.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.91 : 3,475.87 = 1,399.83 : x
2. Step 2: Convert to fraction form
   2,518.91/3,475.87 = 1,399.83/x
3. Step 3: Cross multiply
   2,518.91x = 3,475.87 × 1,399.83
4. Step 4: Simplify right side
   2,518.91x = 4,865,627.10
5. Step 5: Solve for x
   x = 4,865,627.10/2,518.91
6. Step 6: Final answer
   x = 1,931.64