Finding the Third Proportional to 132,155 and 212,790

Step by Step Solution

1. Step 1: Write the proportion equation
   132,155 : 212,790 = 212,790 : x
2. Step 2: Convert to fraction form
   132,155/212,790 = 212,790/x
3. Step 3: Cross multiply
   132,155x = 212,790 × 212,790
4. Step 4: Simplify right side
   132,155x = 45,279,584,100
5. Step 5: Solve for x
   x = 45,279,584,100/132,155
6. Step 6: Final answer
   x = 342,624.83