Finding the Third Proportional to 414,301 and 639,767.50

Step by Step Solution

1. Step 1: Write the proportion equation
   414,301 : 639,767.50 = 639,767.50 : x
2. Step 2: Convert to fraction form
   414,301/639,767.50 = 639,767.50/x
3. Step 3: Cross multiply
   414,301x = 639,767.50 × 639,767.50
4. Step 4: Simplify right side
   414,301x = 409,302,454,056.25
5. Step 5: Solve for x
   x = 409,302,454,056.25/414,301
6. Step 6: Final answer
   x = 987,934.99