Finding the Third Proportional to 149,853.38 and 321,030

Step by Step Solution

1. Step 1: Write the proportion equation
   149,853.38 : 321,030 = 321,030 : x
2. Step 2: Convert to fraction form
   149,853.38/321,030 = 321,030/x
3. Step 3: Cross multiply
   149,853.38x = 321,030 × 321,030
4. Step 4: Simplify right side
   149,853.38x = 103,060,260,900
5. Step 5: Solve for x
   x = 103,060,260,900/149,853.38
6. Step 6: Final answer
   x = 687,740.67