Finding the Third Proportional to 8,499,478 and 12,820,376

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499,478 : 12,820,376 = 12,820,376 : x
2. Step 2: Convert to fraction form
   8,499,478/12,820,376 = 12,820,376/x
3. Step 3: Cross multiply
   8,499,478x = 12,820,376 × 12,820,376
4. Step 4: Simplify right side
   8,499,478x = 164,362,040,781,376
5. Step 5: Solve for x
   x = 164,362,040,781,376/8,499,478
6. Step 6: Final answer
   x = 19,337,898.25