Finding the Third Proportional to 315,849 and 684,900

Step by Step Solution

1. Step 1: Write the proportion equation
   315,849 : 684,900 = 684,900 : x
2. Step 2: Convert to fraction form
   315,849/684,900 = 684,900/x
3. Step 3: Cross multiply
   315,849x = 684,900 × 684,900
4. Step 4: Simplify right side
   315,849x = 469,088,010,000
5. Step 5: Solve for x
   x = 469,088,010,000/315,849
6. Step 6: Final answer
   x = 1,485,165.41