Finding the Third Proportional to 158,790 and 330,648

Step by Step Solution

1. Step 1: Write the proportion equation
   158,790 : 330,648 = 330,648 : x
2. Step 2: Convert to fraction form
   158,790/330,648 = 330,648/x
3. Step 3: Cross multiply
   158,790x = 330,648 × 330,648
4. Step 4: Simplify right side
   158,790x = 109,328,099,904
5. Step 5: Solve for x
   x = 109,328,099,904/158,790
6. Step 6: Final answer
   x = 688,507.46