Finding the Third Proportional to 2,159,872 and 4,640,272

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159,872 : 4,640,272 = 4,640,272 : x
2. Step 2: Convert to fraction form
   2,159,872/4,640,272 = 4,640,272/x
3. Step 3: Cross multiply
   2,159,872x = 4,640,272 × 4,640,272
4. Step 4: Simplify right side
   2,159,872x = 21,532,124,233,984
5. Step 5: Solve for x
   x = 21,532,124,233,984/2,159,872
6. Step 6: Final answer
   x = 9,969,166.80