Finding the Third Proportional to 663,623 and 1,021,405

Step by Step Solution

1. Step 1: Write the proportion equation
   663,623 : 1,021,405 = 1,021,405 : x
2. Step 2: Convert to fraction form
   663,623/1,021,405 = 1,021,405/x
3. Step 3: Cross multiply
   663,623x = 1,021,405 × 1,021,405
4. Step 4: Simplify right side
   663,623x = 1,043,268,174,025
5. Step 5: Solve for x
   x = 1,043,268,174,025/663,623
6. Step 6: Final answer
   x = 1,572,079.59