Finding the Fourth Proportional to 2,518.66, 3,475.86 and 1,399.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.66 : 3,475.86 = 1,399.59 : x
2. Step 2: Convert to fraction form
   2,518.66/3,475.86 = 1,399.59/x
3. Step 3: Cross multiply
   2,518.66x = 3,475.86 × 1,399.59
4. Step 4: Simplify right side
   2,518.66x = 4,864,778.90
5. Step 5: Solve for x
   x = 4,864,778.90/2,518.66
6. Step 6: Final answer
   x = 1,931.49