Finding the Fourth Proportional to 2,661.30, 3,989.49 and 1,359.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.30 : 3,989.49 = 1,359.90 : x
2. Step 2: Convert to fraction form
   2,661.30/3,989.49 = 1,359.90/x
3. Step 3: Cross multiply
   2,661.30x = 3,989.49 × 1,359.90
4. Step 4: Simplify right side
   2,661.30x = 5,425,307.45
5. Step 5: Solve for x
   x = 5,425,307.45/2,661.30
6. Step 6: Final answer
   x = 2,038.59