Finding the Third Proportional to 140,571 and 309,942

Step by Step Solution

1. Step 1: Write the proportion equation
   140,571 : 309,942 = 309,942 : x
2. Step 2: Convert to fraction form
   140,571/309,942 = 309,942/x
3. Step 3: Cross multiply
   140,571x = 309,942 × 309,942
4. Step 4: Simplify right side
   140,571x = 96,064,043,364
5. Step 5: Solve for x
   x = 96,064,043,364/140,571
6. Step 6: Final answer
   x = 683,384.51