Finding the Fourth Proportional to 2,142.75, 2,957.00 and 1,211.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.75 : 2,957.00 = 1,211.43 : x
2. Step 2: Convert to fraction form
   2,142.75/2,957.00 = 1,211.43/x
3. Step 3: Cross multiply
   2,142.75x = 2,957.00 × 1,211.43
4. Step 4: Simplify right side
   2,142.75x = 3,582,192.45
5. Step 5: Solve for x
   x = 3,582,192.45/2,142.75
6. Step 6: Final answer
   x = 1,671.77