Finding the Third Proportional to 155,510 and 418,918

Step by Step Solution

1. Step 1: Write the proportion equation
   155,510 : 418,918 = 418,918 : x
2. Step 2: Convert to fraction form
   155,510/418,918 = 418,918/x
3. Step 3: Cross multiply
   155,510x = 418,918 × 418,918
4. Step 4: Simplify right side
   155,510x = 175,492,290,724
5. Step 5: Solve for x
   x = 175,492,290,724/155,510
6. Step 6: Final answer
   x = 1,128,495.21