Finding the Third Proportional to 140,979 and 309,996

Step by Step Solution

1. Step 1: Write the proportion equation
   140,979 : 309,996 = 309,996 : x
2. Step 2: Convert to fraction form
   140,979/309,996 = 309,996/x
3. Step 3: Cross multiply
   140,979x = 309,996 × 309,996
4. Step 4: Simplify right side
   140,979x = 96,097,520,016
5. Step 5: Solve for x
   x = 96,097,520,016/140,979
6. Step 6: Final answer
   x = 681,644.22