Finding the Third Proportional to 878,394 and 1,917,420

Step by Step Solution

1. Step 1: Write the proportion equation
   878,394 : 1,917,420 = 1,917,420 : x
2. Step 2: Convert to fraction form
   878,394/1,917,420 = 1,917,420/x
3. Step 3: Cross multiply
   878,394x = 1,917,420 × 1,917,420
4. Step 4: Simplify right side
   878,394x = 3,676,499,456,400
5. Step 5: Solve for x
   x = 3,676,499,456,400/878,394
6. Step 6: Final answer
   x = 4,185,478.79