Finding the Fourth Proportional to 2,143.09, 2,957.57 and 1,618.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.09 : 2,957.57 = 1,618.21 : x
2. Step 2: Convert to fraction form
   2,143.09/2,957.57 = 1,618.21/x
3. Step 3: Cross multiply
   2,143.09x = 2,957.57 × 1,618.21
4. Step 4: Simplify right side
   2,143.09x = 4,785,969.35
5. Step 5: Solve for x
   x = 4,785,969.35/2,143.09
6. Step 6: Final answer
   x = 2,233.21