Finding the Third Proportional to 139,327 and 208,666

Step by Step Solution

1. Step 1: Write the proportion equation
   139,327 : 208,666 = 208,666 : x
2. Step 2: Convert to fraction form
   139,327/208,666 = 208,666/x
3. Step 3: Cross multiply
   139,327x = 208,666 × 208,666
4. Step 4: Simplify right side
   139,327x = 43,541,499,556
5. Step 5: Solve for x
   x = 43,541,499,556/139,327
6. Step 6: Final answer
   x = 312,513.01