Finding the Fourth Proportional to 2,518.72, 3,475.64 and 1,399.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,518.72 : 3,475.64 = 1,399.56 : x
2. Step 2: Convert to fraction form
   2,518.72/3,475.64 = 1,399.56/x
3. Step 3: Cross multiply
   2,518.72x = 3,475.64 × 1,399.56
4. Step 4: Simplify right side
   2,518.72x = 4,864,366.72
5. Step 5: Solve for x
   x = 4,864,366.72/2,518.72
6. Step 6: Final answer
   x = 1,931.29