Finding the Fourth Proportional to 2,659.41, 3,989.78 and 1,339.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.41 : 3,989.78 = 1,339.92 : x
2. Step 2: Convert to fraction form
   2,659.41/3,989.78 = 1,339.92/x
3. Step 3: Cross multiply
   2,659.41x = 3,989.78 × 1,339.92
4. Step 4: Simplify right side
   2,659.41x = 5,345,979.32
5. Step 5: Solve for x
   x = 5,345,979.32/2,659.41
6. Step 6: Final answer
   x = 2,010.21