Finding the Third Proportional to 400,518 and 619,950

Step by Step Solution

1. Step 1: Write the proportion equation
   400,518 : 619,950 = 619,950 : x
2. Step 2: Convert to fraction form
   400,518/619,950 = 619,950/x
3. Step 3: Cross multiply
   400,518x = 619,950 × 619,950
4. Step 4: Simplify right side
   400,518x = 384,338,002,500
5. Step 5: Solve for x
   x = 384,338,002,500/400,518
6. Step 6: Final answer
   x = 959,602.32