Finding the Third Proportional to 4,609,656 and 9,957,886

Step by Step Solution

1. Step 1: Write the proportion equation
   4,609,656 : 9,957,886 = 9,957,886 : x
2. Step 2: Convert to fraction form
   4,609,656/9,957,886 = 9,957,886/x
3. Step 3: Cross multiply
   4,609,656x = 9,957,886 × 9,957,886
4. Step 4: Simplify right side
   4,609,656x = 99,159,493,588,996
5. Step 5: Solve for x
   x = 99,159,493,588,996/4,609,656
6. Step 6: Final answer
   x = 21,511,256.72