Finding the Third Proportional to 646,784 and 1,319,872

Step by Step Solution

1. Step 1: Write the proportion equation
   646,784 : 1,319,872 = 1,319,872 : x
2. Step 2: Convert to fraction form
   646,784/1,319,872 = 1,319,872/x
3. Step 3: Cross multiply
   646,784x = 1,319,872 × 1,319,872
4. Step 4: Simplify right side
   646,784x = 1,742,062,096,384
5. Step 5: Solve for x
   x = 1,742,062,096,384/646,784
6. Step 6: Final answer
   x = 2,693,421.75