Finding the Fourth Proportional to 2,699.80, 4,042.17 and 1,380.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,699.80 : 4,042.17 = 1,380.71 : x
2. Step 2: Convert to fraction form
   2,699.80/4,042.17 = 1,380.71/x
3. Step 3: Cross multiply
   2,699.80x = 4,042.17 × 1,380.71
4. Step 4: Simplify right side
   2,699.80x = 5,581,074.65
5. Step 5: Solve for x
   x = 5,581,074.65/2,699.80
6. Step 6: Final answer
   x = 2,067.22