Finding the Fourth Proportional to 2,287.45, 3,156.46 and 1,690.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.45 : 3,156.46 = 1,690.31 : x
2. Step 2: Convert to fraction form
   2,287.45/3,156.46 = 1,690.31/x
3. Step 3: Cross multiply
   2,287.45x = 3,156.46 × 1,690.31
4. Step 4: Simplify right side
   2,287.45x = 5,335,399.57
5. Step 5: Solve for x
   x = 5,335,399.57/2,287.45
6. Step 6: Final answer
   x = 2,332.47