Finding the Fourth Proportional to 3,856.57, 5,785.76 and 1,259.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.57 : 5,785.76 = 1,259.50 : x
2. Step 2: Convert to fraction form
   3,856.57/5,785.76 = 1,259.50/x
3. Step 3: Cross multiply
   3,856.57x = 5,785.76 × 1,259.50
4. Step 4: Simplify right side
   3,856.57x = 7,287,164.72
5. Step 5: Solve for x
   x = 7,287,164.72/3,856.57
6. Step 6: Final answer
   x = 1,889.55