Finding the Fourth Proportional to 2,143.89, 3,215.79 and 683.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.89 : 3,215.79 = 683.02 : x
2. Step 2: Convert to fraction form
   2,143.89/3,215.79 = 683.02/x
3. Step 3: Cross multiply
   2,143.89x = 3,215.79 × 683.02
4. Step 4: Simplify right side
   2,143.89x = 2,196,442.55
5. Step 5: Solve for x
   x = 2,196,442.55/2,143.89
6. Step 6: Final answer
   x = 1,024.52