Finding the Fourth Proportional to 2,189.82, 3,020.88 and 1,305.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.82 : 3,020.88 = 1,305.12 : x
2. Step 2: Convert to fraction form
   2,189.82/3,020.88 = 1,305.12/x
3. Step 3: Cross multiply
   2,189.82x = 3,020.88 × 1,305.12
4. Step 4: Simplify right side
   2,189.82x = 3,942,610.91
5. Step 5: Solve for x
   x = 3,942,610.91/2,189.82
6. Step 6: Final answer
   x = 1,800.43