Finding the Third Proportional to 215,352 and 320,923.69

Step by Step Solution

1. Step 1: Write the proportion equation
   215,352 : 320,923.69 = 320,923.69 : x
2. Step 2: Convert to fraction form
   215,352/320,923.69 = 320,923.69/x
3. Step 3: Cross multiply
   215,352x = 320,923.69 × 320,923.69
4. Step 4: Simplify right side
   215,352x = 102,992,013,198.60
5. Step 5: Solve for x
   x = 102,992,013,198.60/215,352
6. Step 6: Final answer
   x = 478,249.62