Finding the Third Proportional to 3,558 and 3,878

Step by Step Solution

1. Step 1: Write the proportion equation
   3,558 : 3,878 = 3,878 : x
2. Step 2: Convert to fraction form
   3,558/3,878 = 3,878/x
3. Step 3: Cross multiply
   3,558x = 3,878 × 3,878
4. Step 4: Simplify right side
   3,558x = 15,038,884
5. Step 5: Solve for x
   x = 15,038,884/3,558
6. Step 6: Final answer
   x = 4,226.78