Finding the Fourth Proportional to 2,189.50, 3,020.78 and 1,305.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.50 : 3,020.78 = 1,305.18 : x
2. Step 2: Convert to fraction form
   2,189.50/3,020.78 = 1,305.18/x
3. Step 3: Cross multiply
   2,189.50x = 3,020.78 × 1,305.18
4. Step 4: Simplify right side
   2,189.50x = 3,942,661.64
5. Step 5: Solve for x
   x = 3,942,661.64/2,189.50
6. Step 6: Final answer
   x = 1,800.71