Finding the Third Proportional to 308,321 and 672,520

Step by Step Solution

1. Step 1: Write the proportion equation
   308,321 : 672,520 = 672,520 : x
2. Step 2: Convert to fraction form
   308,321/672,520 = 672,520/x
3. Step 3: Cross multiply
   308,321x = 672,520 × 672,520
4. Step 4: Simplify right side
   308,321x = 452,283,150,400
5. Step 5: Solve for x
   x = 452,283,150,400/308,321
6. Step 6: Final answer
   x = 1,466,922.95