Finding the Fourth Proportional to 2,188.56, 3,020.22 and 1,257

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.56 : 3,020.22 = 1,257 : x
2. Step 2: Convert to fraction form
   2,188.56/3,020.22 = 1,257/x
3. Step 3: Cross multiply
   2,188.56x = 3,020.22 × 1,257
4. Step 4: Simplify right side
   2,188.56x = 3,796,416.54
5. Step 5: Solve for x
   x = 3,796,416.54/2,188.56
6. Step 6: Final answer
   x = 1,734.66