Finding the Fourth Proportional to 2,438.30, 3,659.38 and 1,399.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.30 : 3,659.38 = 1,399.28 : x
2. Step 2: Convert to fraction form
   2,438.30/3,659.38 = 1,399.28/x
3. Step 3: Cross multiply
   2,438.30x = 3,659.38 × 1,399.28
4. Step 4: Simplify right side
   2,438.30x = 5,120,475.45
5. Step 5: Solve for x
   x = 5,120,475.45/2,438.30
6. Step 6: Final answer
   x = 2,100.02