Finding the Third Proportional to 249,990 and 550,002

Step by Step Solution

1. Step 1: Write the proportion equation
   249,990 : 550,002 = 550,002 : x
2. Step 2: Convert to fraction form
   249,990/550,002 = 550,002/x
3. Step 3: Cross multiply
   249,990x = 550,002 × 550,002
4. Step 4: Simplify right side
   249,990x = 302,502,200,004
5. Step 5: Solve for x
   x = 302,502,200,004/249,990
6. Step 6: Final answer
   x = 1,210,057.20