Finding the Third Proportional to 8,509,644 and 12,773,172

Step by Step Solution

1. Step 1: Write the proportion equation
   8,509,644 : 12,773,172 = 12,773,172 : x
2. Step 2: Convert to fraction form
   8,509,644/12,773,172 = 12,773,172/x
3. Step 3: Cross multiply
   8,509,644x = 12,773,172 × 12,773,172
4. Step 4: Simplify right side
   8,509,644x = 163,153,922,941,584
5. Step 5: Solve for x
   x = 163,153,922,941,584/8,509,644
6. Step 6: Final answer
   x = 19,172,825.91