Finding the Fourth Proportional to 3,855.86, 5,782.50 and 1,258.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.86 : 5,782.50 = 1,258.18 : x
2. Step 2: Convert to fraction form
   3,855.86/5,782.50 = 1,258.18/x
3. Step 3: Cross multiply
   3,855.86x = 5,782.50 × 1,258.18
4. Step 4: Simplify right side
   3,855.86x = 7,275,425.85
5. Step 5: Solve for x
   x = 7,275,425.85/3,855.86
6. Step 6: Final answer
   x = 1,886.85