Finding the Third Proportional to 128,418 and 188,910

Step by Step Solution

1. Step 1: Write the proportion equation
   128,418 : 188,910 = 188,910 : x
2. Step 2: Convert to fraction form
   128,418/188,910 = 188,910/x
3. Step 3: Cross multiply
   128,418x = 188,910 × 188,910
4. Step 4: Simplify right side
   128,418x = 35,686,988,100
5. Step 5: Solve for x
   x = 35,686,988,100/128,418
6. Step 6: Final answer
   x = 277,897.09