Finding the Third Proportional to 150,637 and 321,290

Step by Step Solution

1. Step 1: Write the proportion equation
   150,637 : 321,290 = 321,290 : x
2. Step 2: Convert to fraction form
   150,637/321,290 = 321,290/x
3. Step 3: Cross multiply
   150,637x = 321,290 × 321,290
4. Step 4: Simplify right side
   150,637x = 103,227,264,100
5. Step 5: Solve for x
   x = 103,227,264,100/150,637
6. Step 6: Final answer
   x = 685,271.64