Finding the Third Proportional to 308,978 and 491,666

Step by Step Solution

1. Step 1: Write the proportion equation
   308,978 : 491,666 = 491,666 : x
2. Step 2: Convert to fraction form
   308,978/491,666 = 491,666/x
3. Step 3: Cross multiply
   308,978x = 491,666 × 491,666
4. Step 4: Simplify right side
   308,978x = 241,735,455,556
5. Step 5: Solve for x
   x = 241,735,455,556/308,978
6. Step 6: Final answer
   x = 782,371.09