Finding the Fourth Proportional to 1,864.32, 2,572.72 and 1,078.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864.32 : 2,572.72 = 1,078.35 : x
2. Step 2: Convert to fraction form
   1,864.32/2,572.72 = 1,078.35/x
3. Step 3: Cross multiply
   1,864.32x = 2,572.72 × 1,078.35
4. Step 4: Simplify right side
   1,864.32x = 2,774,292.61
5. Step 5: Solve for x
   x = 2,774,292.61/1,864.32
6. Step 6: Final answer
   x = 1,488.10