Finding the Fourth Proportional to 2,315.94, 3,198.80 and 1,685.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.94 : 3,198.80 = 1,685.47 : x
2. Step 2: Convert to fraction form
   2,315.94/3,198.80 = 1,685.47/x
3. Step 3: Cross multiply
   2,315.94x = 3,198.80 × 1,685.47
4. Step 4: Simplify right side
   2,315.94x = 5,391,477.65
5. Step 5: Solve for x
   x = 5,391,477.65/2,315.94
6. Step 6: Final answer
   x = 2,327.99