Finding the Third Proportional to 518,144 and 1,221,392

Step by Step Solution

1. Step 1: Write the proportion equation
   518,144 : 1,221,392 = 1,221,392 : x
2. Step 2: Convert to fraction form
   518,144/1,221,392 = 1,221,392/x
3. Step 3: Cross multiply
   518,144x = 1,221,392 × 1,221,392
4. Step 4: Simplify right side
   518,144x = 1,491,798,417,664
5. Step 5: Solve for x
   x = 1,491,798,417,664/518,144
6. Step 6: Final answer
   x = 2,879,119.35