Finding the Third Proportional to 223,128 and 490,338

Step by Step Solution

1. Step 1: Write the proportion equation
   223,128 : 490,338 = 490,338 : x
2. Step 2: Convert to fraction form
   223,128/490,338 = 490,338/x
3. Step 3: Cross multiply
   223,128x = 490,338 × 490,338
4. Step 4: Simplify right side
   223,128x = 240,431,354,244
5. Step 5: Solve for x
   x = 240,431,354,244/223,128
6. Step 6: Final answer
   x = 1,077,549.00