Finding the Fourth Proportional to 2,871.42, 4,306.89 and 1,139.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,871.42 : 4,306.89 = 1,139.58 : x
2. Step 2: Convert to fraction form
   2,871.42/4,306.89 = 1,139.58/x
3. Step 3: Cross multiply
   2,871.42x = 4,306.89 × 1,139.58
4. Step 4: Simplify right side
   2,871.42x = 4,908,045.71
5. Step 5: Solve for x
   x = 4,908,045.71/2,871.42
6. Step 6: Final answer
   x = 1,709.27