Finding the Third Proportional to 145,158 and 309,999

Step by Step Solution

1. Step 1: Write the proportion equation
   145,158 : 309,999 = 309,999 : x
2. Step 2: Convert to fraction form
   145,158/309,999 = 309,999/x
3. Step 3: Cross multiply
   145,158x = 309,999 × 309,999
4. Step 4: Simplify right side
   145,158x = 96,099,380,001
5. Step 5: Solve for x
   x = 96,099,380,001/145,158
6. Step 6: Final answer
   x = 662,032.96