Finding the Third Proportional to 9,778,959 and 21,240,786

Step by Step Solution

1. Step 1: Write the proportion equation
   9,778,959 : 21,240,786 = 21,240,786 : x
2. Step 2: Convert to fraction form
   9,778,959/21,240,786 = 21,240,786/x
3. Step 3: Cross multiply
   9,778,959x = 21,240,786 × 21,240,786
4. Step 4: Simplify right side
   9,778,959x = 451,170,989,897,796
5. Step 5: Solve for x
   x = 451,170,989,897,796/9,778,959
6. Step 6: Final answer
   x = 46,136,913.95