Finding the Third Proportional to 3,918 and 5,321.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918 : 5,321.25 = 5,321.25 : x
2. Step 2: Convert to fraction form
   3,918/5,321.25 = 5,321.25/x
3. Step 3: Cross multiply
   3,918x = 5,321.25 × 5,321.25
4. Step 4: Simplify right side
   3,918x = 28,315,701.56
5. Step 5: Solve for x
   x = 28,315,701.56/3,918
6. Step 6: Final answer
   x = 7,227.08