Finding the Third Proportional to 299,401.50 and 646,780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   299,401.50 : 646,780.50 = 646,780.50 : x
2. Step 2: Convert to fraction form
   299,401.50/646,780.50 = 646,780.50/x
3. Step 3: Cross multiply
   299,401.50x = 646,780.50 × 646,780.50
4. Step 4: Simplify right side
   299,401.50x = 418,325,015,180.25
5. Step 5: Solve for x
   x = 418,325,015,180.25/299,401.50
6. Step 6: Final answer
   x = 1,397,204.14