Finding the Fourth Proportional to 2,374.05, 3,559.68 and 1,139.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,374.05 : 3,559.68 = 1,139.78 : x
2. Step 2: Convert to fraction form
   2,374.05/3,559.68 = 1,139.78/x
3. Step 3: Cross multiply
   2,374.05x = 3,559.68 × 1,139.78
4. Step 4: Simplify right side
   2,374.05x = 4,057,234.27
5. Step 5: Solve for x
   x = 4,057,234.27/2,374.05
6. Step 6: Final answer
   x = 1,708.99