Finding the Third Proportional to 858,306 and 1,298,503

Step by Step Solution

1. Step 1: Write the proportion equation
   858,306 : 1,298,503 = 1,298,503 : x
2. Step 2: Convert to fraction form
   858,306/1,298,503 = 1,298,503/x
3. Step 3: Cross multiply
   858,306x = 1,298,503 × 1,298,503
4. Step 4: Simplify right side
   858,306x = 1,686,110,041,009
5. Step 5: Solve for x
   x = 1,686,110,041,009/858,306
6. Step 6: Final answer
   x = 1,964,462.61