Finding the Third Proportional to 9,912 and 19,656

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912 : 19,656 = 19,656 : x
2. Step 2: Convert to fraction form
   9,912/19,656 = 19,656/x
3. Step 3: Cross multiply
   9,912x = 19,656 × 19,656
4. Step 4: Simplify right side
   9,912x = 386,358,336
5. Step 5: Solve for x
   x = 386,358,336/9,912
6. Step 6: Final answer
   x = 38,978.85