Finding the Third Proportional to 308,315 and 672,508

Step by Step Solution

1. Step 1: Write the proportion equation
   308,315 : 672,508 = 672,508 : x
2. Step 2: Convert to fraction form
   308,315/672,508 = 672,508/x
3. Step 3: Cross multiply
   308,315x = 672,508 × 672,508
4. Step 4: Simplify right side
   308,315x = 452,267,010,064
5. Step 5: Solve for x
   x = 452,267,010,064/308,315
6. Step 6: Final answer
   x = 1,466,899.15