Finding the Fourth Proportional to 3,856.91, 5,785.98 and 1,392.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.91 : 5,785.98 = 1,392.34 : x
2. Step 2: Convert to fraction form
   3,856.91/5,785.98 = 1,392.34/x
3. Step 3: Cross multiply
   3,856.91x = 5,785.98 × 1,392.34
4. Step 4: Simplify right side
   3,856.91x = 8,056,036.93
5. Step 5: Solve for x
   x = 8,056,036.93/3,856.91
6. Step 6: Final answer
   x = 2,088.73