Finding the Fourth Proportional to 1,864.27, 2,572.76 and 1,078.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.27 : 2,572.76 = 1,078.31 : x
2. Step 2: Convert to fraction form
   1,864.27/2,572.76 = 1,078.31/x
3. Step 3: Cross multiply
   1,864.27x = 2,572.76 × 1,078.31
4. Step 4: Simplify right side
   1,864.27x = 2,774,241.96
5. Step 5: Solve for x
   x = 2,774,241.96/1,864.27
6. Step 6: Final answer
   x = 1,488.12