Finding the Third Proportional to 878,440 and 1,284,150

Step by Step Solution

1. Step 1: Write the proportion equation
   878,440 : 1,284,150 = 1,284,150 : x
2. Step 2: Convert to fraction form
   878,440/1,284,150 = 1,284,150/x
3. Step 3: Cross multiply
   878,440x = 1,284,150 × 1,284,150
4. Step 4: Simplify right side
   878,440x = 1,649,041,222,500
5. Step 5: Solve for x
   x = 1,649,041,222,500/878,440
6. Step 6: Final answer
   x = 1,877,238.31