Finding the Fourth Proportional to 3,878.42, 5,816.82 and 1,280.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.42 : 5,816.82 = 1,280.76 : x
2. Step 2: Convert to fraction form
   3,878.42/5,816.82 = 1,280.76/x
3. Step 3: Cross multiply
   3,878.42x = 5,816.82 × 1,280.76
4. Step 4: Simplify right side
   3,878.42x = 7,449,950.38
5. Step 5: Solve for x
   x = 7,449,950.38/3,878.42
6. Step 6: Final answer
   x = 1,920.87