Finding the Third Proportional to 6,638,841 and 10,556,406

Step by Step Solution

1. Step 1: Write the proportion equation
   6,638,841 : 10,556,406 = 10,556,406 : x
2. Step 2: Convert to fraction form
   6,638,841/10,556,406 = 10,556,406/x
3. Step 3: Cross multiply
   6,638,841x = 10,556,406 × 10,556,406
4. Step 4: Simplify right side
   6,638,841x = 111,437,707,636,836
5. Step 5: Solve for x
   x = 111,437,707,636,836/6,638,841
6. Step 6: Final answer
   x = 16,785,717.21