Finding the Third Proportional to 162,978 and 336,108

Step by Step Solution

1. Step 1: Write the proportion equation
   162,978 : 336,108 = 336,108 : x
2. Step 2: Convert to fraction form
   162,978/336,108 = 336,108/x
3. Step 3: Cross multiply
   162,978x = 336,108 × 336,108
4. Step 4: Simplify right side
   162,978x = 112,968,587,664
5. Step 5: Solve for x
   x = 112,968,587,664/162,978
6. Step 6: Final answer
   x = 693,152.37