Finding the Fourth Proportional to 2,145.71, 3,218.58 and 1,049.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.71 : 3,218.58 = 1,049.78 : x
2. Step 2: Convert to fraction form
   2,145.71/3,218.58 = 1,049.78/x
3. Step 3: Cross multiply
   2,145.71x = 3,218.58 × 1,049.78
4. Step 4: Simplify right side
   2,145.71x = 3,378,800.91
5. Step 5: Solve for x
   x = 3,378,800.91/2,145.71
6. Step 6: Final answer
   x = 1,574.68