Finding the Third Proportional to 90,436 and 189,132

Step by Step Solution

1. Step 1: Write the proportion equation
   90,436 : 189,132 = 189,132 : x
2. Step 2: Convert to fraction form
   90,436/189,132 = 189,132/x
3. Step 3: Cross multiply
   90,436x = 189,132 × 189,132
4. Step 4: Simplify right side
   90,436x = 35,770,913,424
5. Step 5: Solve for x
   x = 35,770,913,424/90,436
6. Step 6: Final answer
   x = 395,538.43