Finding the Third Proportional to 308,472 and 672,978

Step by Step Solution

1. Step 1: Write the proportion equation
   308,472 : 672,978 = 672,978 : x
2. Step 2: Convert to fraction form
   308,472/672,978 = 672,978/x
3. Step 3: Cross multiply
   308,472x = 672,978 × 672,978
4. Step 4: Simplify right side
   308,472x = 452,899,388,484
5. Step 5: Solve for x
   x = 452,899,388,484/308,472
6. Step 6: Final answer
   x = 1,468,202.59