Finding the Third Proportional to 155,422 and 321,901

Step by Step Solution

1. Step 1: Write the proportion equation
   155,422 : 321,901 = 321,901 : x
2. Step 2: Convert to fraction form
   155,422/321,901 = 321,901/x
3. Step 3: Cross multiply
   155,422x = 321,901 × 321,901
4. Step 4: Simplify right side
   155,422x = 103,620,253,801
5. Step 5: Solve for x
   x = 103,620,253,801/155,422
6. Step 6: Final answer
   x = 666,702.61