Finding the Third Proportional to 12,820,391 and 19,824,559

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820,391 : 19,824,559 = 19,824,559 : x
2. Step 2: Convert to fraction form
   12,820,391/19,824,559 = 19,824,559/x
3. Step 3: Cross multiply
   12,820,391x = 19,824,559 × 19,824,559
4. Step 4: Simplify right side
   12,820,391x = 393,013,139,544,481
5. Step 5: Solve for x
   x = 393,013,139,544,481/12,820,391
6. Step 6: Final answer
   x = 30,655,316.17