Finding the Third Proportional to 3,928 and 5,290

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928 : 5,290 = 5,290 : x
2. Step 2: Convert to fraction form
   3,928/5,290 = 5,290/x
3. Step 3: Cross multiply
   3,928x = 5,290 × 5,290
4. Step 4: Simplify right side
   3,928x = 27,984,100
5. Step 5: Solve for x
   x = 27,984,100/3,928
6. Step 6: Final answer
   x = 7,124.26