Finding the Fourth Proportional to 2,142.31, 2,957.05 and 1,986.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.31 : 2,957.05 = 1,986.49 : x
2. Step 2: Convert to fraction form
   2,142.31/2,957.05 = 1,986.49/x
3. Step 3: Cross multiply
   2,142.31x = 2,957.05 × 1,986.49
4. Step 4: Simplify right side
   2,142.31x = 5,874,150.25
5. Step 5: Solve for x
   x = 5,874,150.25/2,142.31
6. Step 6: Final answer
   x = 2,741.97