Finding the Fourth Proportional to 2,275.81, 3,142.17 and 1,678.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.81 : 3,142.17 = 1,678.38 : x
2. Step 2: Convert to fraction form
   2,275.81/3,142.17 = 1,678.38/x
3. Step 3: Cross multiply
   2,275.81x = 3,142.17 × 1,678.38
4. Step 4: Simplify right side
   2,275.81x = 5,273,739.57
5. Step 5: Solve for x
   x = 5,273,739.57/2,275.81
6. Step 6: Final answer
   x = 2,317.30