Finding the Fourth Proportional to 3,878.58, 5,818.78 and 1,281.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.58 : 5,818.78 = 1,281.50 : x
2. Step 2: Convert to fraction form
   3,878.58/5,818.78 = 1,281.50/x
3. Step 3: Cross multiply
   3,878.58x = 5,818.78 × 1,281.50
4. Step 4: Simplify right side
   3,878.58x = 7,456,766.57
5. Step 5: Solve for x
   x = 7,456,766.57/3,878.58
6. Step 6: Final answer
   x = 1,922.55