Finding the Third Proportional to 12,982,872 and 20,182,308

Step by Step Solution

1. Step 1: Write the proportion equation
   12,982,872 : 20,182,308 = 20,182,308 : x
2. Step 2: Convert to fraction form
   12,982,872/20,182,308 = 20,182,308/x
3. Step 3: Cross multiply
   12,982,872x = 20,182,308 × 20,182,308
4. Step 4: Simplify right side
   12,982,872x = 407,325,556,206,864
5. Step 5: Solve for x
   x = 407,325,556,206,864/12,982,872
6. Step 6: Final answer
   x = 31,374,071.64