Finding the Third Proportional to 149,898 and 321,048

Step by Step Solution

1. Step 1: Write the proportion equation
   149,898 : 321,048 = 321,048 : x
2. Step 2: Convert to fraction form
   149,898/321,048 = 321,048/x
3. Step 3: Cross multiply
   149,898x = 321,048 × 321,048
4. Step 4: Simplify right side
   149,898x = 103,071,818,304
5. Step 5: Solve for x
   x = 103,071,818,304/149,898
6. Step 6: Final answer
   x = 687,613.03