Finding the Fourth Proportional to 2,572.38, 3,856.28 and 928.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.38 : 3,856.28 = 928.56 : x
2. Step 2: Convert to fraction form
   2,572.38/3,856.28 = 928.56/x
3. Step 3: Cross multiply
   2,572.38x = 3,856.28 × 928.56
4. Step 4: Simplify right side
   2,572.38x = 3,580,805.01
5. Step 5: Solve for x
   x = 3,580,805.01/2,572.38
6. Step 6: Final answer
   x = 1,392.02