Finding the Fourth Proportional to 2,142.96, 2,957.04 and 1,211.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.96 : 2,957.04 = 1,211.28 : x
2. Step 2: Convert to fraction form
   2,142.96/2,957.04 = 1,211.28/x
3. Step 3: Cross multiply
   2,142.96x = 2,957.04 × 1,211.28
4. Step 4: Simplify right side
   2,142.96x = 3,581,803.41
5. Step 5: Solve for x
   x = 3,581,803.41/2,142.96
6. Step 6: Final answer
   x = 1,671.43