Finding the Third Proportional to 162,990 and 336,132

Step by Step Solution

1. Step 1: Write the proportion equation
   162,990 : 336,132 = 336,132 : x
2. Step 2: Convert to fraction form
   162,990/336,132 = 336,132/x
3. Step 3: Cross multiply
   162,990x = 336,132 × 336,132
4. Step 4: Simplify right side
   162,990x = 112,984,721,424
5. Step 5: Solve for x
   x = 112,984,721,424/162,990
6. Step 6: Final answer
   x = 693,200.33