Finding the Fourth Proportional to 2,142.73, 2,956.58 and 1,211.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.73 : 2,956.58 = 1,211.23 : x
2. Step 2: Convert to fraction form
   2,142.73/2,956.58 = 1,211.23/x
3. Step 3: Cross multiply
   2,142.73x = 2,956.58 × 1,211.23
4. Step 4: Simplify right side
   2,142.73x = 3,581,083.61
5. Step 5: Solve for x
   x = 3,581,083.61/2,142.73
6. Step 6: Final answer
   x = 1,671.28