Finding the Third Proportional to 3,870 and 5,558

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870 : 5,558 = 5,558 : x
2. Step 2: Convert to fraction form
   3,870/5,558 = 5,558/x
3. Step 3: Cross multiply
   3,870x = 5,558 × 5,558
4. Step 4: Simplify right side
   3,870x = 30,891,364
5. Step 5: Solve for x
   x = 30,891,364/3,870
6. Step 6: Final answer
   x = 7,982.26