Finding the Fourth Proportional to 1,879.49, 2,815.59 and 1,385

Step by Step Solution

1. Step 1: Write the proportion equation
   1,879.49 : 2,815.59 = 1,385 : x
2. Step 2: Convert to fraction form
   1,879.49/2,815.59 = 1,385/x
3. Step 3: Cross multiply
   1,879.49x = 2,815.59 × 1,385
4. Step 4: Simplify right side
   1,879.49x = 3,899,592.15
5. Step 5: Solve for x
   x = 3,899,592.15/1,879.49
6. Step 6: Final answer
   x = 2,074.81