Finding the Fourth Proportional to 2,886.43, 3,983.70 and 2,139.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,886.43 : 3,983.70 = 2,139.34 : x
2. Step 2: Convert to fraction form
   2,886.43/3,983.70 = 2,139.34/x
3. Step 3: Cross multiply
   2,886.43x = 3,983.70 × 2,139.34
4. Step 4: Simplify right side
   2,886.43x = 8,522,488.76
5. Step 5: Solve for x
   x = 8,522,488.76/2,886.43
6. Step 6: Final answer
   x = 2,952.61