Finding the Third Proportional to 726,156 and 1,678,320

Step by Step Solution

1. Step 1: Write the proportion equation
   726,156 : 1,678,320 = 1,678,320 : x
2. Step 2: Convert to fraction form
   726,156/1,678,320 = 1,678,320/x
3. Step 3: Cross multiply
   726,156x = 1,678,320 × 1,678,320
4. Step 4: Simplify right side
   726,156x = 2,816,758,022,400
5. Step 5: Solve for x
   x = 2,816,758,022,400/726,156
6. Step 6: Final answer
   x = 3,878,998.48