Finding the Fourth Proportional to 2,697.36, 4,047.12 and 1,399.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,697.36 : 4,047.12 = 1,399.20 : x
2. Step 2: Convert to fraction form
   2,697.36/4,047.12 = 1,399.20/x
3. Step 3: Cross multiply
   2,697.36x = 4,047.12 × 1,399.20
4. Step 4: Simplify right side
   2,697.36x = 5,662,730.30
5. Step 5: Solve for x
   x = 5,662,730.30/2,697.36
6. Step 6: Final answer
   x = 2,099.36