Finding the Fourth Proportional to 2,188.92, 3,020.72 and 1,257.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.92 : 3,020.72 = 1,257.42 : x
2. Step 2: Convert to fraction form
   2,188.92/3,020.72 = 1,257.42/x
3. Step 3: Cross multiply
   2,188.92x = 3,020.72 × 1,257.42
4. Step 4: Simplify right side
   2,188.92x = 3,798,307.46
5. Step 5: Solve for x
   x = 3,798,307.46/2,188.92
6. Step 6: Final answer
   x = 1,735.24