Finding the Fourth Proportional to 2,308.57, 3,185.89 and 1,260.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.57 : 3,185.89 = 1,260.70 : x
2. Step 2: Convert to fraction form
   2,308.57/3,185.89 = 1,260.70/x
3. Step 3: Cross multiply
   2,308.57x = 3,185.89 × 1,260.70
4. Step 4: Simplify right side
   2,308.57x = 4,016,429.29
5. Step 5: Solve for x
   x = 4,016,429.29/2,308.57
6. Step 6: Final answer
   x = 1,739.79