Finding the Third Proportional to 3,940,421 and 8,553,418

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940,421 : 8,553,418 = 8,553,418 : x
2. Step 2: Convert to fraction form
   3,940,421/8,553,418 = 8,553,418/x
3. Step 3: Cross multiply
   3,940,421x = 8,553,418 × 8,553,418
4. Step 4: Simplify right side
   3,940,421x = 73,160,959,482,724
5. Step 5: Solve for x
   x = 73,160,959,482,724/3,940,421
6. Step 6: Final answer
   x = 18,566,787.53