Finding the Third Proportional to 2,129,429 and 4,644,228

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129,429 : 4,644,228 = 4,644,228 : x
2. Step 2: Convert to fraction form
   2,129,429/4,644,228 = 4,644,228/x
3. Step 3: Cross multiply
   2,129,429x = 4,644,228 × 4,644,228
4. Step 4: Simplify right side
   2,129,429x = 21,568,853,715,984
5. Step 5: Solve for x
   x = 21,568,853,715,984/2,129,429
6. Step 6: Final answer
   x = 10,128,937.72