Finding the Fourth Proportional to 3,890.55, 5,836.59 and 1,258.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,890.55 : 5,836.59 = 1,258.71 : x
2. Step 2: Convert to fraction form
   3,890.55/5,836.59 = 1,258.71/x
3. Step 3: Cross multiply
   3,890.55x = 5,836.59 × 1,258.71
4. Step 4: Simplify right side
   3,890.55x = 7,346,571.05
5. Step 5: Solve for x
   x = 7,346,571.05/3,890.55
6. Step 6: Final answer
   x = 1,888.31