Finding the Third Proportional to 8,426,644 and 12,728,522

Step by Step Solution

1. Step 1: Write the proportion equation
   8,426,644 : 12,728,522 = 12,728,522 : x
2. Step 2: Convert to fraction form
   8,426,644/12,728,522 = 12,728,522/x
3. Step 3: Cross multiply
   8,426,644x = 12,728,522 × 12,728,522
4. Step 4: Simplify right side
   8,426,644x = 162,015,272,304,484
5. Step 5: Solve for x
   x = 162,015,272,304,484/8,426,644
6. Step 6: Final answer
   x = 19,226,547.64