Finding the Fourth Proportional to 2,662.32, 3,986.49 and 2,139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.32 : 3,986.49 = 2,139.54 : x
2. Step 2: Convert to fraction form
   2,662.32/3,986.49 = 2,139.54/x
3. Step 3: Cross multiply
   2,662.32x = 3,986.49 × 2,139.54
4. Step 4: Simplify right side
   2,662.32x = 8,529,254.81
5. Step 5: Solve for x
   x = 8,529,254.81/2,662.32
6. Step 6: Final answer
   x = 3,203.69