Finding the Fourth Proportional to 2,078.35, 3,120.24 and 1,389.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.35 : 3,120.24 = 1,389.44 : x
2. Step 2: Convert to fraction form
   2,078.35/3,120.24 = 1,389.44/x
3. Step 3: Cross multiply
   2,078.35x = 3,120.24 × 1,389.44
4. Step 4: Simplify right side
   2,078.35x = 4,335,386.27
5. Step 5: Solve for x
   x = 4,335,386.27/2,078.35
6. Step 6: Final answer
   x = 2,085.98