Finding the Fourth Proportional to 2,095.80, 3,139.09 and 1,399.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,095.80 : 3,139.09 = 1,399.21 : x
2. Step 2: Convert to fraction form
   2,095.80/3,139.09 = 1,399.21/x
3. Step 3: Cross multiply
   2,095.80x = 3,139.09 × 1,399.21
4. Step 4: Simplify right side
   2,095.80x = 4,392,223.43
5. Step 5: Solve for x
   x = 4,392,223.43/2,095.80
6. Step 6: Final answer
   x = 2,095.73