Finding the Third Proportional to 321,300 and 480,978

Step by Step Solution

1. Step 1: Write the proportion equation
   321,300 : 480,978 = 480,978 : x
2. Step 2: Convert to fraction form
   321,300/480,978 = 480,978/x
3. Step 3: Cross multiply
   321,300x = 480,978 × 480,978
4. Step 4: Simplify right side
   321,300x = 231,339,836,484
5. Step 5: Solve for x
   x = 231,339,836,484/321,300
6. Step 6: Final answer
   x = 720,011.94