Finding the Fourth Proportional to 1,685.40, 2,513.23 and 1,568.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.40 : 2,513.23 = 1,568.55 : x
2. Step 2: Convert to fraction form
   1,685.40/2,513.23 = 1,568.55/x
3. Step 3: Cross multiply
   1,685.40x = 2,513.23 × 1,568.55
4. Step 4: Simplify right side
   1,685.40x = 3,942,126.92
5. Step 5: Solve for x
   x = 3,942,126.92/1,685.40
6. Step 6: Final answer
   x = 2,338.99