Finding the Third Proportional to 1,780,578 and 3,945,420

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780,578 : 3,945,420 = 3,945,420 : x
2. Step 2: Convert to fraction form
   1,780,578/3,945,420 = 3,945,420/x
3. Step 3: Cross multiply
   1,780,578x = 3,945,420 × 3,945,420
4. Step 4: Simplify right side
   1,780,578x = 15,566,338,976,400
5. Step 5: Solve for x
   x = 15,566,338,976,400/1,780,578
6. Step 6: Final answer
   x = 8,742,295.47