Finding the Third Proportional to 139,449 and 209,491

Step by Step Solution

1. Step 1: Write the proportion equation
   139,449 : 209,491 = 209,491 : x
2. Step 2: Convert to fraction form
   139,449/209,491 = 209,491/x
3. Step 3: Cross multiply
   139,449x = 209,491 × 209,491
4. Step 4: Simplify right side
   139,449x = 43,886,479,081
5. Step 5: Solve for x
   x = 43,886,479,081/139,449
6. Step 6: Final answer
   x = 314,713.47