Finding the Third Proportional to 6,215.50 and 8,690.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,215.50 : 8,690.25 = 8,690.25 : x
2. Step 2: Convert to fraction form
   6,215.50/8,690.25 = 8,690.25/x
3. Step 3: Cross multiply
   6,215.50x = 8,690.25 × 8,690.25
4. Step 4: Simplify right side
   6,215.50x = 75,520,445.06
5. Step 5: Solve for x
   x = 75,520,445.06/6,215.50
6. Step 6: Final answer
   x = 12,150.34