Finding the Fourth Proportional to 2,389.47, 3,582.64 and 928.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.47 : 3,582.64 = 928.77 : x
2. Step 2: Convert to fraction form
   2,389.47/3,582.64 = 928.77/x
3. Step 3: Cross multiply
   2,389.47x = 3,582.64 × 928.77
4. Step 4: Simplify right side
   2,389.47x = 3,327,448.55
5. Step 5: Solve for x
   x = 3,327,448.55/2,389.47
6. Step 6: Final answer
   x = 1,392.55