Finding the Fourth Proportional to 2,143.10, 2,957.94 and 1,640.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.10 : 2,957.94 = 1,640.30 : x
2. Step 2: Convert to fraction form
   2,143.10/2,957.94 = 1,640.30/x
3. Step 3: Cross multiply
   2,143.10x = 2,957.94 × 1,640.30
4. Step 4: Simplify right side
   2,143.10x = 4,851,894.19
5. Step 5: Solve for x
   x = 4,851,894.19/2,143.10
6. Step 6: Final answer
   x = 2,263.96