Finding the Third Proportional to 8,499,465 and 12,820,356

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499,465 : 12,820,356 = 12,820,356 : x
2. Step 2: Convert to fraction form
   8,499,465/12,820,356 = 12,820,356/x
3. Step 3: Cross multiply
   8,499,465x = 12,820,356 × 12,820,356
4. Step 4: Simplify right side
   8,499,465x = 164,361,527,966,736
5. Step 5: Solve for x
   x = 164,361,527,966,736/8,499,465
6. Step 6: Final answer
   x = 19,337,867.50