Finding the Fourth Proportional to 2,078.56, 3,119.79 and 1,385.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.56 : 3,119.79 = 1,385.71 : x
2. Step 2: Convert to fraction form
   2,078.56/3,119.79 = 1,385.71/x
3. Step 3: Cross multiply
   2,078.56x = 3,119.79 × 1,385.71
4. Step 4: Simplify right side
   2,078.56x = 4,323,124.20
5. Step 5: Solve for x
   x = 4,323,124.20/2,078.56
6. Step 6: Final answer
   x = 2,079.87