Finding the Third Proportional to 640,506 and 1,379,976

Step by Step Solution

1. Step 1: Write the proportion equation
   640,506 : 1,379,976 = 1,379,976 : x
2. Step 2: Convert to fraction form
   640,506/1,379,976 = 1,379,976/x
3. Step 3: Cross multiply
   640,506x = 1,379,976 × 1,379,976
4. Step 4: Simplify right side
   640,506x = 1,904,333,760,576
5. Step 5: Solve for x
   x = 1,904,333,760,576/640,506
6. Step 6: Final answer
   x = 2,973,170.84