Finding the Third Proportional to 6,211.50 and 8,689.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,211.50 : 8,689.50 = 8,689.50 : x
2. Step 2: Convert to fraction form
   6,211.50/8,689.50 = 8,689.50/x
3. Step 3: Cross multiply
   6,211.50x = 8,689.50 × 8,689.50
4. Step 4: Simplify right side
   6,211.50x = 75,507,410.25
5. Step 5: Solve for x
   x = 75,507,410.25/6,211.50
6. Step 6: Final answer
   x = 12,156.07