Finding the Fourth Proportional to 2,251.29, 3,106.78 and 1,256.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,251.29 : 3,106.78 = 1,256.57 : x
2. Step 2: Convert to fraction form
   2,251.29/3,106.78 = 1,256.57/x
3. Step 3: Cross multiply
   2,251.29x = 3,106.78 × 1,256.57
4. Step 4: Simplify right side
   2,251.29x = 3,903,872.37
5. Step 5: Solve for x
   x = 3,903,872.37/2,251.29
6. Step 6: Final answer
   x = 1,734.06