Finding the Third Proportional to 414,302 and 639,768.50

Step by Step Solution

1. Step 1: Write the proportion equation
   414,302 : 639,768.50 = 639,768.50 : x
2. Step 2: Convert to fraction form
   414,302/639,768.50 = 639,768.50/x
3. Step 3: Cross multiply
   414,302x = 639,768.50 × 639,768.50
4. Step 4: Simplify right side
   414,302x = 409,303,733,592.25
5. Step 5: Solve for x
   x = 409,303,733,592.25/414,302
6. Step 6: Final answer
   x = 987,935.69