Finding the Fourth Proportional to 2,708.14, 4,054.72 and 1,389.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,708.14 : 4,054.72 = 1,389.05 : x
2. Step 2: Convert to fraction form
   2,708.14/4,054.72 = 1,389.05/x
3. Step 3: Cross multiply
   2,708.14x = 4,054.72 × 1,389.05
4. Step 4: Simplify right side
   2,708.14x = 5,632,208.82
5. Step 5: Solve for x
   x = 5,632,208.82/2,708.14
6. Step 6: Final answer
   x = 2,079.73