Finding the Third Proportional to 6,990 and 12,015

Step by Step Solution

1. Step 1: Write the proportion equation
   6,990 : 12,015 = 12,015 : x
2. Step 2: Convert to fraction form
   6,990/12,015 = 12,015/x
3. Step 3: Cross multiply
   6,990x = 12,015 × 12,015
4. Step 4: Simplify right side
   6,990x = 144,360,225
5. Step 5: Solve for x
   x = 144,360,225/6,990
6. Step 6: Final answer
   x = 20,652.39