Finding the Fourth Proportional to 2,518.53, 3,475.39 and 1,399.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.53 : 3,475.39 = 1,399.41 : x
2. Step 2: Convert to fraction form
   2,518.53/3,475.39 = 1,399.41/x
3. Step 3: Cross multiply
   2,518.53x = 3,475.39 × 1,399.41
4. Step 4: Simplify right side
   2,518.53x = 4,863,495.52
5. Step 5: Solve for x
   x = 4,863,495.52/2,518.53
6. Step 6: Final answer
   x = 1,931.09