Finding the Fourth Proportional to 1,864.05, 2,572.85 and 1,078.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.05 : 2,572.85 = 1,078.55 : x
2. Step 2: Convert to fraction form
   1,864.05/2,572.85 = 1,078.55/x
3. Step 3: Cross multiply
   1,864.05x = 2,572.85 × 1,078.55
4. Step 4: Simplify right side
   1,864.05x = 2,774,947.37
5. Step 5: Solve for x
   x = 2,774,947.37/1,864.05
6. Step 6: Final answer
   x = 1,488.67