Finding the Fourth Proportional to 2,005.09, 3,003.02 and 1,389.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.09 : 3,003.02 = 1,389.23 : x
2. Step 2: Convert to fraction form
   2,005.09/3,003.02 = 1,389.23/x
3. Step 3: Cross multiply
   2,005.09x = 3,003.02 × 1,389.23
4. Step 4: Simplify right side
   2,005.09x = 4,171,885.47
5. Step 5: Solve for x
   x = 4,171,885.47/2,005.09
6. Step 6: Final answer
   x = 2,080.65