Finding the Third Proportional to 284,556 and 426,090

Step by Step Solution

1. Step 1: Write the proportion equation
   284,556 : 426,090 = 426,090 : x
2. Step 2: Convert to fraction form
   284,556/426,090 = 426,090/x
3. Step 3: Cross multiply
   284,556x = 426,090 × 426,090
4. Step 4: Simplify right side
   284,556x = 181,552,688,100
5. Step 5: Solve for x
   x = 181,552,688,100/284,556
6. Step 6: Final answer
   x = 638,020.95