Finding the Third Proportional to 139,997 and 307,210

Step by Step Solution

1. Step 1: Write the proportion equation
   139,997 : 307,210 = 307,210 : x
2. Step 2: Convert to fraction form
   139,997/307,210 = 307,210/x
3. Step 3: Cross multiply
   139,997x = 307,210 × 307,210
4. Step 4: Simplify right side
   139,997x = 94,377,984,100
5. Step 5: Solve for x
   x = 94,377,984,100/139,997
6. Step 6: Final answer
   x = 674,142.90