Finding the Third Proportional to 139,491 and 213,975

Step by Step Solution

1. Step 1: Write the proportion equation
   139,491 : 213,975 = 213,975 : x
2. Step 2: Convert to fraction form
   139,491/213,975 = 213,975/x
3. Step 3: Cross multiply
   139,491x = 213,975 × 213,975
4. Step 4: Simplify right side
   139,491x = 45,785,300,625
5. Step 5: Solve for x
   x = 45,785,300,625/139,491
6. Step 6: Final answer
   x = 328,231.22