Finding the Fourth Proportional to 2,275.91, 3,139.48 and 1,685.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.91 : 3,139.48 = 1,685.42 : x
2. Step 2: Convert to fraction form
   2,275.91/3,139.48 = 1,685.42/x
3. Step 3: Cross multiply
   2,275.91x = 3,139.48 × 1,685.42
4. Step 4: Simplify right side
   2,275.91x = 5,291,342.38
5. Step 5: Solve for x
   x = 5,291,342.38/2,275.91
6. Step 6: Final answer
   x = 2,324.93