Finding the Third Proportional to 2,143,278 and 3,315,699

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143,278 : 3,315,699 = 3,315,699 : x
2. Step 2: Convert to fraction form
   2,143,278/3,315,699 = 3,315,699/x
3. Step 3: Cross multiply
   2,143,278x = 3,315,699 × 3,315,699
4. Step 4: Simplify right side
   2,143,278x = 10,993,859,858,601
5. Step 5: Solve for x
   x = 10,993,859,858,601/2,143,278
6. Step 6: Final answer
   x = 5,129,460.51