Finding the Fourth Proportional to 1,680.57, 2,517.82 and 1,581.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.57 : 2,517.82 = 1,581.75 : x
2. Step 2: Convert to fraction form
   1,680.57/2,517.82 = 1,581.75/x
3. Step 3: Cross multiply
   1,680.57x = 2,517.82 × 1,581.75
4. Step 4: Simplify right side
   1,680.57x = 3,982,557.83
5. Step 5: Solve for x
   x = 3,982,557.83/1,680.57
6. Step 6: Final answer
   x = 2,369.77