Finding the Fourth Proportional to 3,878.34, 5,818.10 and 1,280.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,878.34 : 5,818.10 = 1,280.67 : x
2. Step 2: Convert to fraction form
   3,878.34/5,818.10 = 1,280.67/x
3. Step 3: Cross multiply
   3,878.34x = 5,818.10 × 1,280.67
4. Step 4: Simplify right side
   3,878.34x = 7,451,059.72
5. Step 5: Solve for x
   x = 7,451,059.72/3,878.34
6. Step 6: Final answer
   x = 1,921.20