Finding the Third Proportional to 201,399 and 423,510

Step by Step Solution

1. Step 1: Write the proportion equation
   201,399 : 423,510 = 423,510 : x
2. Step 2: Convert to fraction form
   201,399/423,510 = 423,510/x
3. Step 3: Cross multiply
   201,399x = 423,510 × 423,510
4. Step 4: Simplify right side
   201,399x = 179,360,720,100
5. Step 5: Solve for x
   x = 179,360,720,100/201,399
6. Step 6: Final answer
   x = 890,574.04