Finding the Third Proportional to 858,279 and 1,298,467

Step by Step Solution

1. Step 1: Write the proportion equation
   858,279 : 1,298,467 = 1,298,467 : x
2. Step 2: Convert to fraction form
   858,279/1,298,467 = 1,298,467/x
3. Step 3: Cross multiply
   858,279x = 1,298,467 × 1,298,467
4. Step 4: Simplify right side
   858,279x = 1,686,016,550,089
5. Step 5: Solve for x
   x = 1,686,016,550,089/858,279
6. Step 6: Final answer
   x = 1,964,415.48