Finding the Fourth Proportional to 2,255.34, 3,112.42 and 1,260.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.34 : 3,112.42 = 1,260.78 : x
2. Step 2: Convert to fraction form
   2,255.34/3,112.42 = 1,260.78/x
3. Step 3: Cross multiply
   2,255.34x = 3,112.42 × 1,260.78
4. Step 4: Simplify right side
   2,255.34x = 3,924,076.89
5. Step 5: Solve for x
   x = 3,924,076.89/2,255.34
6. Step 6: Final answer
   x = 1,739.91