Finding the Third Proportional to 400,117 and 619,345

Step by Step Solution

1. Step 1: Write the proportion equation
   400,117 : 619,345 = 619,345 : x
2. Step 2: Convert to fraction form
   400,117/619,345 = 619,345/x
3. Step 3: Cross multiply
   400,117x = 619,345 × 619,345
4. Step 4: Simplify right side
   400,117x = 383,588,229,025
5. Step 5: Solve for x
   x = 383,588,229,025/400,117
6. Step 6: Final answer
   x = 958,690.16