Finding the Third Proportional to 140,992 and 218,454

Step by Step Solution

1. Step 1: Write the proportion equation
   140,992 : 218,454 = 218,454 : x
2. Step 2: Convert to fraction form
   140,992/218,454 = 218,454/x
3. Step 3: Cross multiply
   140,992x = 218,454 × 218,454
4. Step 4: Simplify right side
   140,992x = 47,722,150,116
5. Step 5: Solve for x
   x = 47,722,150,116/140,992
6. Step 6: Final answer
   x = 338,474.17