Finding the Third Proportional to 140,448 and 212,460

Step by Step Solution

1. Step 1: Write the proportion equation
   140,448 : 212,460 = 212,460 : x
2. Step 2: Convert to fraction form
   140,448/212,460 = 212,460/x
3. Step 3: Cross multiply
   140,448x = 212,460 × 212,460
4. Step 4: Simplify right side
   140,448x = 45,139,251,600
5. Step 5: Solve for x
   x = 45,139,251,600/140,448
6. Step 6: Final answer
   x = 321,394.76