Finding the Fourth Proportional to 2,189.88, 3,020.53 and 1,305

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.88 : 3,020.53 = 1,305 : x
2. Step 2: Convert to fraction form
   2,189.88/3,020.53 = 1,305/x
3. Step 3: Cross multiply
   2,189.88x = 3,020.53 × 1,305
4. Step 4: Simplify right side
   2,189.88x = 3,941,791.65
5. Step 5: Solve for x
   x = 3,941,791.65/2,189.88
6. Step 6: Final answer
   x = 1,800.00