Finding the Fourth Proportional to 2,139.20, 2,945.23 and 1,863.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.20 : 2,945.23 = 1,863.08 : x
2. Step 2: Convert to fraction form
   2,139.20/2,945.23 = 1,863.08/x
3. Step 3: Cross multiply
   2,139.20x = 2,945.23 × 1,863.08
4. Step 4: Simplify right side
   2,139.20x = 5,487,179.72
5. Step 5: Solve for x
   x = 5,487,179.72/2,139.20
6. Step 6: Final answer
   x = 2,565.07