Finding the Fourth Proportional to 2,405.30, 3,586.94 and 2,139.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.30 : 3,586.94 = 2,139.82 : x
2. Step 2: Convert to fraction form
   2,405.30/3,586.94 = 2,139.82/x
3. Step 3: Cross multiply
   2,405.30x = 3,586.94 × 2,139.82
4. Step 4: Simplify right side
   2,405.30x = 7,675,402.33
5. Step 5: Solve for x
   x = 7,675,402.33/2,405.30
6. Step 6: Final answer
   x = 3,191.04