Finding the Fourth Proportional to 2,518.80, 3,475.83 and 1,399.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.80 : 3,475.83 = 1,399.80 : x
2. Step 2: Convert to fraction form
   2,518.80/3,475.83 = 1,399.80/x
3. Step 3: Cross multiply
   2,518.80x = 3,475.83 × 1,399.80
4. Step 4: Simplify right side
   2,518.80x = 4,865,466.83
5. Step 5: Solve for x
   x = 4,865,466.83/2,518.80
6. Step 6: Final answer
   x = 1,931.66