Finding the Third Proportional to 2,159,889 and 4,640,307

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159,889 : 4,640,307 = 4,640,307 : x
2. Step 2: Convert to fraction form
   2,159,889/4,640,307 = 4,640,307/x
3. Step 3: Cross multiply
   2,159,889x = 4,640,307 × 4,640,307
4. Step 4: Simplify right side
   2,159,889x = 21,532,449,054,249
5. Step 5: Solve for x
   x = 21,532,449,054,249/2,159,889
6. Step 6: Final answer
   x = 9,969,238.72