Finding the Fourth Proportional to 2,255.31, 3,112.63 and 1,260.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.31 : 3,112.63 = 1,260.70 : x
2. Step 2: Convert to fraction form
   2,255.31/3,112.63 = 1,260.70/x
3. Step 3: Cross multiply
   2,255.31x = 3,112.63 × 1,260.70
4. Step 4: Simplify right side
   2,255.31x = 3,924,081.71
5. Step 5: Solve for x
   x = 3,924,081.71/2,255.31
6. Step 6: Final answer
   x = 1,739.93