Finding the Third Proportional to 400,550 and 619,995

Step by Step Solution

1. Step 1: Write the proportion equation
   400,550 : 619,995 = 619,995 : x
2. Step 2: Convert to fraction form
   400,550/619,995 = 619,995/x
3. Step 3: Cross multiply
   400,550x = 619,995 × 619,995
4. Step 4: Simplify right side
   400,550x = 384,393,800,025
5. Step 5: Solve for x
   x = 384,393,800,025/400,550
6. Step 6: Final answer
   x = 959,664.96