Finding the Fourth Proportional to 3,878.56, 5,816.52 and 1,280.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.56 : 5,816.52 = 1,280.86 : x
2. Step 2: Convert to fraction form
   3,878.56/5,816.52 = 1,280.86/x
3. Step 3: Cross multiply
   3,878.56x = 5,816.52 × 1,280.86
4. Step 4: Simplify right side
   3,878.56x = 7,450,147.81
5. Step 5: Solve for x
   x = 7,450,147.81/3,878.56
6. Step 6: Final answer
   x = 1,920.85