Finding the Third Proportional to 1,185,129 and 1,689,723

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185,129 : 1,689,723 = 1,689,723 : x
2. Step 2: Convert to fraction form
   1,185,129/1,689,723 = 1,689,723/x
3. Step 3: Cross multiply
   1,185,129x = 1,689,723 × 1,689,723
4. Step 4: Simplify right side
   1,185,129x = 2,855,163,816,729
5. Step 5: Solve for x
   x = 2,855,163,816,729/1,185,129
6. Step 6: Final answer
   x = 2,409,158.68