Finding the Third Proportional to 9,939,510 and 21,678,354

Step by Step Solution

1. Step 1: Write the proportion equation
   9,939,510 : 21,678,354 = 21,678,354 : x
2. Step 2: Convert to fraction form
   9,939,510/21,678,354 = 21,678,354/x
3. Step 3: Cross multiply
   9,939,510x = 21,678,354 × 21,678,354
4. Step 4: Simplify right side
   9,939,510x = 469,951,032,149,316
5. Step 5: Solve for x
   x = 469,951,032,149,316/9,939,510
6. Step 6: Final answer
   x = 47,281,106.63