Finding the Fourth Proportional to 1,683.16, 2,522.52 and 860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,683.16 : 2,522.52 = 860.72 : x
2. Step 2: Convert to fraction form
   1,683.16/2,522.52 = 860.72/x
3. Step 3: Cross multiply
   1,683.16x = 2,522.52 × 860.72
4. Step 4: Simplify right side
   1,683.16x = 2,171,183.41
5. Step 5: Solve for x
   x = 2,171,183.41/1,683.16
6. Step 6: Final answer
   x = 1,289.94