Finding the Fourth Proportional to 2,678.72, 4,018.68 and 829.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.72 : 4,018.68 = 829.89 : x
2. Step 2: Convert to fraction form
   2,678.72/4,018.68 = 829.89/x
3. Step 3: Cross multiply
   2,678.72x = 4,018.68 × 829.89
4. Step 4: Simplify right side
   2,678.72x = 3,335,062.35
5. Step 5: Solve for x
   x = 3,335,062.35/2,678.72
6. Step 6: Final answer
   x = 1,245.02