Finding the Fourth Proportional to 2,189.06, 3,020.55 and 1,257.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.06 : 3,020.55 = 1,257.38 : x
2. Step 2: Convert to fraction form
   2,189.06/3,020.55 = 1,257.38/x
3. Step 3: Cross multiply
   2,189.06x = 3,020.55 × 1,257.38
4. Step 4: Simplify right side
   2,189.06x = 3,797,979.16
5. Step 5: Solve for x
   x = 3,797,979.16/2,189.06
6. Step 6: Final answer
   x = 1,734.98