Finding the Third Proportional to 309,072 and 662,502

Step by Step Solution

1. Step 1: Write the proportion equation
   309,072 : 662,502 = 662,502 : x
2. Step 2: Convert to fraction form
   309,072/662,502 = 662,502/x
3. Step 3: Cross multiply
   309,072x = 662,502 × 662,502
4. Step 4: Simplify right side
   309,072x = 438,908,900,004
5. Step 5: Solve for x
   x = 438,908,900,004/309,072
6. Step 6: Final answer
   x = 1,420,086.26