Finding the Third Proportional to 8,722,366 and 12,831,645

Step by Step Solution

1. Step 1: Write the proportion equation
   8,722,366 : 12,831,645 = 12,831,645 : x
2. Step 2: Convert to fraction form
   8,722,366/12,831,645 = 12,831,645/x
3. Step 3: Cross multiply
   8,722,366x = 12,831,645 × 12,831,645
4. Step 4: Simplify right side
   8,722,366x = 164,651,113,406,025
5. Step 5: Solve for x
   x = 164,651,113,406,025/8,722,366
6. Step 6: Final answer
   x = 18,876,886.55