Finding the Third Proportional to 149,808 and 321,648

Step by Step Solution

1. Step 1: Write the proportion equation
   149,808 : 321,648 = 321,648 : x
2. Step 2: Convert to fraction form
   149,808/321,648 = 321,648/x
3. Step 3: Cross multiply
   149,808x = 321,648 × 321,648
4. Step 4: Simplify right side
   149,808x = 103,457,435,904
5. Step 5: Solve for x
   x = 103,457,435,904/149,808
6. Step 6: Final answer
   x = 690,600.21