Finding the Third Proportional to 126,436 and 189,990

Step by Step Solution

1. Step 1: Write the proportion equation
   126,436 : 189,990 = 189,990 : x
2. Step 2: Convert to fraction form
   126,436/189,990 = 189,990/x
3. Step 3: Cross multiply
   126,436x = 189,990 × 189,990
4. Step 4: Simplify right side
   126,436x = 36,096,200,100
5. Step 5: Solve for x
   x = 36,096,200,100/126,436
6. Step 6: Final answer
   x = 285,489.89