Finding the Third Proportional to 638,729 and 1,001,978

Step by Step Solution

1. Step 1: Write the proportion equation
   638,729 : 1,001,978 = 1,001,978 : x
2. Step 2: Convert to fraction form
   638,729/1,001,978 = 1,001,978/x
3. Step 3: Cross multiply
   638,729x = 1,001,978 × 1,001,978
4. Step 4: Simplify right side
   638,729x = 1,003,959,912,484
5. Step 5: Solve for x
   x = 1,003,959,912,484/638,729
6. Step 6: Final answer
   x = 1,571,808.88