Finding the Fourth Proportional to 3,397.56, 4,687.59 and 2,139.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,397.56 : 4,687.59 = 2,139.87 : x
2. Step 2: Convert to fraction form
   3,397.56/4,687.59 = 2,139.87/x
3. Step 3: Cross multiply
   3,397.56x = 4,687.59 × 2,139.87
4. Step 4: Simplify right side
   3,397.56x = 10,030,833.21
5. Step 5: Solve for x
   x = 10,030,833.21/3,397.56
6. Step 6: Final answer
   x = 2,952.36