Finding the Third Proportional to 1,221,699 and 1,606,557

Step by Step Solution

1. Step 1: Write the proportion equation
   1,221,699 : 1,606,557 = 1,606,557 : x
2. Step 2: Convert to fraction form
   1,221,699/1,606,557 = 1,606,557/x
3. Step 3: Cross multiply
   1,221,699x = 1,606,557 × 1,606,557
4. Step 4: Simplify right side
   1,221,699x = 2,581,025,394,249
5. Step 5: Solve for x
   x = 2,581,025,394,249/1,221,699
6. Step 6: Final answer
   x = 2,112,652.46