Finding the Third Proportional to 3,862.69 and 8,389.69

Step by Step Solution

1. Step 1: Write the proportion equation
   3,862.69 : 8,389.69 = 8,389.69 : x
2. Step 2: Convert to fraction form
   3,862.69/8,389.69 = 8,389.69/x
3. Step 3: Cross multiply
   3,862.69x = 8,389.69 × 8,389.69
4. Step 4: Simplify right side
   3,862.69x = 70,386,856.35
5. Step 5: Solve for x
   x = 70,386,856.35/3,862.69
6. Step 6: Final answer
   x = 18,222.25