Finding the Third Proportional to 320,431.50 and 431,343

Step by Step Solution

1. Step 1: Write the proportion equation
   320,431.50 : 431,343 = 431,343 : x
2. Step 2: Convert to fraction form
   320,431.50/431,343 = 431,343/x
3. Step 3: Cross multiply
   320,431.50x = 431,343 × 431,343
4. Step 4: Simplify right side
   320,431.50x = 186,056,783,649
5. Step 5: Solve for x
   x = 186,056,783,649/320,431.50
6. Step 6: Final answer
   x = 580,644.49