Finding the Third Proportional to 139,092 and 209,287

Step by Step Solution

1. Step 1: Write the proportion equation
   139,092 : 209,287 = 209,287 : x
2. Step 2: Convert to fraction form
   139,092/209,287 = 209,287/x
3. Step 3: Cross multiply
   139,092x = 209,287 × 209,287
4. Step 4: Simplify right side
   139,092x = 43,801,048,369
5. Step 5: Solve for x
   x = 43,801,048,369/139,092
6. Step 6: Final answer
   x = 314,907.03