Finding the Fourth Proportional to 2,388.54, 3,580.59 and 928.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.54 : 3,580.59 = 928.77 : x
2. Step 2: Convert to fraction form
   2,388.54/3,580.59 = 928.77/x
3. Step 3: Cross multiply
   2,388.54x = 3,580.59 × 928.77
4. Step 4: Simplify right side
   2,388.54x = 3,325,544.57
5. Step 5: Solve for x
   x = 3,325,544.57/2,388.54
6. Step 6: Final answer
   x = 1,392.29