Finding the Fourth Proportional to 2,389.74, 3,582.47 and 928.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.74 : 3,582.47 = 928.55 : x
2. Step 2: Convert to fraction form
   2,389.74/3,582.47 = 928.55/x
3. Step 3: Cross multiply
   2,389.74x = 3,582.47 × 928.55
4. Step 4: Simplify right side
   2,389.74x = 3,326,486.93
5. Step 5: Solve for x
   x = 3,326,486.93/2,389.74
6. Step 6: Final answer
   x = 1,391.99