Finding the Third Proportional to 149,858 and 321,038

Step by Step Solution

1. Step 1: Write the proportion equation
   149,858 : 321,038 = 321,038 : x
2. Step 2: Convert to fraction form
   149,858/321,038 = 321,038/x
3. Step 3: Cross multiply
   149,858x = 321,038 × 321,038
4. Step 4: Simplify right side
   149,858x = 103,065,397,444
5. Step 5: Solve for x
   x = 103,065,397,444/149,858
6. Step 6: Final answer
   x = 687,753.72