Finding the Third Proportional to 8,578,138 and 13,068,456

Step by Step Solution

1. Step 1: Write the proportion equation
   8,578,138 : 13,068,456 = 13,068,456 : x
2. Step 2: Convert to fraction form
   8,578,138/13,068,456 = 13,068,456/x
3. Step 3: Cross multiply
   8,578,138x = 13,068,456 × 13,068,456
4. Step 4: Simplify right side
   8,578,138x = 170,784,542,223,936
5. Step 5: Solve for x
   x = 170,784,542,223,936/8,578,138
6. Step 6: Final answer
   x = 19,909,278.94