Finding the Third Proportional to 521,556 and 789,648

Step by Step Solution

1. Step 1: Write the proportion equation
   521,556 : 789,648 = 789,648 : x
2. Step 2: Convert to fraction form
   521,556/789,648 = 789,648/x
3. Step 3: Cross multiply
   521,556x = 789,648 × 789,648
4. Step 4: Simplify right side
   521,556x = 623,543,963,904
5. Step 5: Solve for x
   x = 623,543,963,904/521,556
6. Step 6: Final answer
   x = 1,195,545.57