Finding the Fourth Proportional to 2,189.34, 3,021.57 and 1,257.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.34 : 3,021.57 = 1,257.84 : x
2. Step 2: Convert to fraction form
   2,189.34/3,021.57 = 1,257.84/x
3. Step 3: Cross multiply
   2,189.34x = 3,021.57 × 1,257.84
4. Step 4: Simplify right side
   2,189.34x = 3,800,651.61
5. Step 5: Solve for x
   x = 3,800,651.61/2,189.34
6. Step 6: Final answer
   x = 1,735.98