Finding the Third Proportional to 320,438 and 483,111

Step by Step Solution

1. Step 1: Write the proportion equation
   320,438 : 483,111 = 483,111 : x
2. Step 2: Convert to fraction form
   320,438/483,111 = 483,111/x
3. Step 3: Cross multiply
   320,438x = 483,111 × 483,111
4. Step 4: Simplify right side
   320,438x = 233,396,238,321
5. Step 5: Solve for x
   x = 233,396,238,321/320,438
6. Step 6: Final answer
   x = 728,366.29