Finding the Third Proportional to 111,405 and 231,990

Step by Step Solution

1. Step 1: Write the proportion equation
   111,405 : 231,990 = 231,990 : x
2. Step 2: Convert to fraction form
   111,405/231,990 = 231,990/x
3. Step 3: Cross multiply
   111,405x = 231,990 × 231,990
4. Step 4: Simplify right side
   111,405x = 53,819,360,100
5. Step 5: Solve for x
   x = 53,819,360,100/111,405
6. Step 6: Final answer
   x = 483,096.45