Finding the Third Proportional to 2,129,490 and 4,644,360

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129,490 : 4,644,360 = 4,644,360 : x
2. Step 2: Convert to fraction form
   2,129,490/4,644,360 = 4,644,360/x
3. Step 3: Cross multiply
   2,129,490x = 4,644,360 × 4,644,360
4. Step 4: Simplify right side
   2,129,490x = 21,570,079,809,600
5. Step 5: Solve for x
   x = 21,570,079,809,600/2,129,490
6. Step 6: Final answer
   x = 10,129,223.34