Finding the Fourth Proportional to 2,678.38, 4,018.79 and 1,380.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.38 : 4,018.79 = 1,380.76 : x
2. Step 2: Convert to fraction form
   2,678.38/4,018.79 = 1,380.76/x
3. Step 3: Cross multiply
   2,678.38x = 4,018.79 × 1,380.76
4. Step 4: Simplify right side
   2,678.38x = 5,548,977.58
5. Step 5: Solve for x
   x = 5,548,977.58/2,678.38
6. Step 6: Final answer
   x = 2,071.77