Finding the Fourth Proportional to 2,678.78, 4,019.31 and 1,036.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.78 : 4,019.31 = 1,036.48 : x
2. Step 2: Convert to fraction form
   2,678.78/4,019.31 = 1,036.48/x
3. Step 3: Cross multiply
   2,678.78x = 4,019.31 × 1,036.48
4. Step 4: Simplify right side
   2,678.78x = 4,165,924.38
5. Step 5: Solve for x
   x = 4,165,924.38/2,678.78
6. Step 6: Final answer
   x = 1,555.16