Finding the Third Proportional to 309,145 and 671,164

Step by Step Solution

1. Step 1: Write the proportion equation
   309,145 : 671,164 = 671,164 : x
2. Step 2: Convert to fraction form
   309,145/671,164 = 671,164/x
3. Step 3: Cross multiply
   309,145x = 671,164 × 671,164
4. Step 4: Simplify right side
   309,145x = 450,461,114,896
5. Step 5: Solve for x
   x = 450,461,114,896/309,145
6. Step 6: Final answer
   x = 1,457,119.20