Finding the Fourth Proportional to 3,856.59, 5,783.58 and 1,258.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,856.59 : 5,783.58 = 1,258.92 : x
2. Step 2: Convert to fraction form
   3,856.59/5,783.58 = 1,258.92/x
3. Step 3: Cross multiply
   3,856.59x = 5,783.58 × 1,258.92
4. Step 4: Simplify right side
   3,856.59x = 7,281,064.53
5. Step 5: Solve for x
   x = 7,281,064.53/3,856.59
6. Step 6: Final answer
   x = 1,887.95