Finding the Third Proportional to 320,778 and 448,465.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,778 : 448,465.50 = 448,465.50 : x
2. Step 2: Convert to fraction form
   320,778/448,465.50 = 448,465.50/x
3. Step 3: Cross multiply
   320,778x = 448,465.50 × 448,465.50
4. Step 4: Simplify right side
   320,778x = 201,121,304,690.25
5. Step 5: Solve for x
   x = 201,121,304,690.25/320,778
6. Step 6: Final answer
   x = 626,979.73