Finding the Third Proportional to 158,978 and 336,910

Step by Step Solution

1. Step 1: Write the proportion equation
   158,978 : 336,910 = 336,910 : x
2. Step 2: Convert to fraction form
   158,978/336,910 = 336,910/x
3. Step 3: Cross multiply
   158,978x = 336,910 × 336,910
4. Step 4: Simplify right side
   158,978x = 113,508,348,100
5. Step 5: Solve for x
   x = 113,508,348,100/158,978
6. Step 6: Final answer
   x = 713,987.77