Finding the Third Proportional to 89,172 and 189,900

Step by Step Solution

1. Step 1: Write the proportion equation
   89,172 : 189,900 = 189,900 : x
2. Step 2: Convert to fraction form
   89,172/189,900 = 189,900/x
3. Step 3: Cross multiply
   89,172x = 189,900 × 189,900
4. Step 4: Simplify right side
   89,172x = 36,062,010,000
5. Step 5: Solve for x
   x = 36,062,010,000/89,172
6. Step 6: Final answer
   x = 404,409.57