Finding the Third Proportional to 878,436 and 1,284,144

Step by Step Solution

1. Step 1: Write the proportion equation
   878,436 : 1,284,144 = 1,284,144 : x
2. Step 2: Convert to fraction form
   878,436/1,284,144 = 1,284,144/x
3. Step 3: Cross multiply
   878,436x = 1,284,144 × 1,284,144
4. Step 4: Simplify right side
   878,436x = 1,649,025,812,736
5. Step 5: Solve for x
   x = 1,649,025,812,736/878,436
6. Step 6: Final answer
   x = 1,877,229.32