Finding the Third Proportional to 6,670.69 and 11,989.69

Step by Step Solution

1. Step 1: Write the proportion equation
   6,670.69 : 11,989.69 = 11,989.69 : x
2. Step 2: Convert to fraction form
   6,670.69/11,989.69 = 11,989.69/x
3. Step 3: Cross multiply
   6,670.69x = 11,989.69 × 11,989.69
4. Step 4: Simplify right side
   6,670.69x = 143,752,606.35
5. Step 5: Solve for x
   x = 143,752,606.35/6,670.69
6. Step 6: Final answer
   x = 21,549.89