Finding the Third Proportional to 642,315 and 1,399,022

Step by Step Solution

1. Step 1: Write the proportion equation
   642,315 : 1,399,022 = 1,399,022 : x
2. Step 2: Convert to fraction form
   642,315/1,399,022 = 1,399,022/x
3. Step 3: Cross multiply
   642,315x = 1,399,022 × 1,399,022
4. Step 4: Simplify right side
   642,315x = 1,957,262,556,484
5. Step 5: Solve for x
   x = 1,957,262,556,484/642,315
6. Step 6: Final answer
   x = 3,047,200.45