Finding the Third Proportional to 414,301.50 and 639,768

Step by Step Solution

1. Step 1: Write the proportion equation
   414,301.50 : 639,768 = 639,768 : x
2. Step 2: Convert to fraction form
   414,301.50/639,768 = 639,768/x
3. Step 3: Cross multiply
   414,301.50x = 639,768 × 639,768
4. Step 4: Simplify right side
   414,301.50x = 409,303,093,824
5. Step 5: Solve for x
   x = 409,303,093,824/414,301.50
6. Step 6: Final answer
   x = 987,935.34