Finding the Fourth Proportional to 2,389.48, 3,579.65 and 1,399.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.48 : 3,579.65 = 1,399.86 : x
2. Step 2: Convert to fraction form
   2,389.48/3,579.65 = 1,399.86/x
3. Step 3: Cross multiply
   2,389.48x = 3,579.65 × 1,399.86
4. Step 4: Simplify right side
   2,389.48x = 5,011,008.85
5. Step 5: Solve for x
   x = 5,011,008.85/2,389.48
6. Step 6: Final answer
   x = 2,097.11