Finding the Fourth Proportional to 1,864.18, 2,572.59 and 1,078.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.18 : 2,572.59 = 1,078.48 : x
2. Step 2: Convert to fraction form
   1,864.18/2,572.59 = 1,078.48/x
3. Step 3: Cross multiply
   1,864.18x = 2,572.59 × 1,078.48
4. Step 4: Simplify right side
   1,864.18x = 2,774,486.86
5. Step 5: Solve for x
   x = 2,774,486.86/1,864.18
6. Step 6: Final answer
   x = 1,488.31