Finding the Fourth Proportional to 1,864.38, 2,572.83 and 1,078.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.38 : 2,572.83 = 1,078.86 : x
2. Step 2: Convert to fraction form
   1,864.38/2,572.83 = 1,078.86/x
3. Step 3: Cross multiply
   1,864.38x = 2,572.83 × 1,078.86
4. Step 4: Simplify right side
   1,864.38x = 2,775,723.37
5. Step 5: Solve for x
   x = 2,775,723.37/1,864.38
6. Step 6: Final answer
   x = 1,488.82