Finding the Fourth Proportional to 2,572.10, 3,856.41 and 928.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.10 : 3,856.41 = 928.41 : x
2. Step 2: Convert to fraction form
   2,572.10/3,856.41 = 928.41/x
3. Step 3: Cross multiply
   2,572.10x = 3,856.41 × 928.41
4. Step 4: Simplify right side
   2,572.10x = 3,580,329.61
5. Step 5: Solve for x
   x = 3,580,329.61/2,572.10
6. Step 6: Final answer
   x = 1,391.99