Finding the Third Proportional to 8,478 and 12,969

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478 : 12,969 = 12,969 : x
2. Step 2: Convert to fraction form
   8,478/12,969 = 12,969/x
3. Step 3: Cross multiply
   8,478x = 12,969 × 12,969
4. Step 4: Simplify right side
   8,478x = 168,194,961
5. Step 5: Solve for x
   x = 168,194,961/8,478
6. Step 6: Final answer
   x = 19,838.99