Finding the Fourth Proportional to 2,388.78, 3,582.33 and 828.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.78 : 3,582.33 = 828.72 : x
2. Step 2: Convert to fraction form
   2,388.78/3,582.33 = 828.72/x
3. Step 3: Cross multiply
   2,388.78x = 3,582.33 × 828.72
4. Step 4: Simplify right side
   2,388.78x = 2,968,748.52
5. Step 5: Solve for x
   x = 2,968,748.52/2,388.78
6. Step 6: Final answer
   x = 1,242.79