Finding the Third Proportional to 68,418 and 109,290

Step by Step Solution

1. Step 1: Write the proportion equation
   68,418 : 109,290 = 109,290 : x
2. Step 2: Convert to fraction form
   68,418/109,290 = 109,290/x
3. Step 3: Cross multiply
   68,418x = 109,290 × 109,290
4. Step 4: Simplify right side
   68,418x = 11,944,304,100
5. Step 5: Solve for x
   x = 11,944,304,100/68,418
6. Step 6: Final answer
   x = 174,578.39