Finding the Third Proportional to 851,709 and 1,309,138

Step by Step Solution

1. Step 1: Write the proportion equation
   851,709 : 1,309,138 = 1,309,138 : x
2. Step 2: Convert to fraction form
   851,709/1,309,138 = 1,309,138/x
3. Step 3: Cross multiply
   851,709x = 1,309,138 × 1,309,138
4. Step 4: Simplify right side
   851,709x = 1,713,842,303,044
5. Step 5: Solve for x
   x = 1,713,842,303,044/851,709
6. Step 6: Final answer
   x = 2,012,239.28