Finding the Third Proportional to 139,085 and 300,343

Step by Step Solution

1. Step 1: Write the proportion equation
   139,085 : 300,343 = 300,343 : x
2. Step 2: Convert to fraction form
   139,085/300,343 = 300,343/x
3. Step 3: Cross multiply
   139,085x = 300,343 × 300,343
4. Step 4: Simplify right side
   139,085x = 90,205,917,649
5. Step 5: Solve for x
   x = 90,205,917,649/139,085
6. Step 6: Final answer
   x = 648,566.83