Finding the Third Proportional to 9,939,512 and 21,678,358

Step by Step Solution

1. Step 1: Write the proportion equation
   9,939,512 : 21,678,358 = 21,678,358 : x
2. Step 2: Convert to fraction form
   9,939,512/21,678,358 = 21,678,358/x
3. Step 3: Cross multiply
   9,939,512x = 21,678,358 × 21,678,358
4. Step 4: Simplify right side
   9,939,512x = 469,951,205,576,164
5. Step 5: Solve for x
   x = 469,951,205,576,164/9,939,512
6. Step 6: Final answer
   x = 47,281,114.56