Finding the Fourth Proportional to 2,518.31, 3,475.42 and 1,399.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.31 : 3,475.42 = 1,399.25 : x
2. Step 2: Convert to fraction form
   2,518.31/3,475.42 = 1,399.25/x
3. Step 3: Cross multiply
   2,518.31x = 3,475.42 × 1,399.25
4. Step 4: Simplify right side
   2,518.31x = 4,862,981.44
5. Step 5: Solve for x
   x = 4,862,981.44/2,518.31
6. Step 6: Final answer
   x = 1,931.05