Finding the Third Proportional to 645,816 and 1,407,884

Step by Step Solution

1. Step 1: Write the proportion equation
   645,816 : 1,407,884 = 1,407,884 : x
2. Step 2: Convert to fraction form
   645,816/1,407,884 = 1,407,884/x
3. Step 3: Cross multiply
   645,816x = 1,407,884 × 1,407,884
4. Step 4: Simplify right side
   645,816x = 1,982,137,357,456
5. Step 5: Solve for x
   x = 1,982,137,357,456/645,816
6. Step 6: Final answer
   x = 3,069,198.28