Finding the Third Proportional to 123,111 and 201,009

Step by Step Solution

1. Step 1: Write the proportion equation
   123,111 : 201,009 = 201,009 : x
2. Step 2: Convert to fraction form
   123,111/201,009 = 201,009/x
3. Step 3: Cross multiply
   123,111x = 201,009 × 201,009
4. Step 4: Simplify right side
   123,111x = 40,404,618,081
5. Step 5: Solve for x
   x = 40,404,618,081/123,111
6. Step 6: Final answer
   x = 328,196.65