Finding the Third Proportional to 9,778,878 and 21,260,290

Step by Step Solution

1. Step 1: Write the proportion equation
   9,778,878 : 21,260,290 = 21,260,290 : x
2. Step 2: Convert to fraction form
   9,778,878/21,260,290 = 21,260,290/x
3. Step 3: Cross multiply
   9,778,878x = 21,260,290 × 21,260,290
4. Step 4: Simplify right side
   9,778,878x = 451,999,930,884,100
5. Step 5: Solve for x
   x = 451,999,930,884,100/9,778,878
6. Step 6: Final answer
   x = 46,222,064.63