Finding the Third Proportional to 9,985,860 and 21,509,910

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985,860 : 21,509,910 = 21,509,910 : x
2. Step 2: Convert to fraction form
   9,985,860/21,509,910 = 21,509,910/x
3. Step 3: Cross multiply
   9,985,860x = 21,509,910 × 21,509,910
4. Step 4: Simplify right side
   9,985,860x = 462,676,228,208,100
5. Step 5: Solve for x
   x = 462,676,228,208,100/9,985,860
6. Step 6: Final answer
   x = 46,333,137.88