Finding the Third Proportional to 320,604 and 500,315.25

Step by Step Solution

1. Step 1: Write the proportion equation
   320,604 : 500,315.25 = 500,315.25 : x
2. Step 2: Convert to fraction form
   320,604/500,315.25 = 500,315.25/x
3. Step 3: Cross multiply
   320,604x = 500,315.25 × 500,315.25
4. Step 4: Simplify right side
   320,604x = 250,315,349,382.56
5. Step 5: Solve for x
   x = 250,315,349,382.56/320,604
6. Step 6: Final answer
   x = 780,761.78