Finding the Fourth Proportional to 2,189.49, 3,020.79 and 1,305.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.49 : 3,020.79 = 1,305.18 : x
2. Step 2: Convert to fraction form
   2,189.49/3,020.79 = 1,305.18/x
3. Step 3: Cross multiply
   2,189.49x = 3,020.79 × 1,305.18
4. Step 4: Simplify right side
   2,189.49x = 3,942,674.69
5. Step 5: Solve for x
   x = 3,942,674.69/2,189.49
6. Step 6: Final answer
   x = 1,800.73