Finding the Third Proportional to 2,578,390 and 5,464,129

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578,390 : 5,464,129 = 5,464,129 : x
2. Step 2: Convert to fraction form
   2,578,390/5,464,129 = 5,464,129/x
3. Step 3: Cross multiply
   2,578,390x = 5,464,129 × 5,464,129
4. Step 4: Simplify right side
   2,578,390x = 29,856,705,728,641
5. Step 5: Solve for x
   x = 29,856,705,728,641/2,578,390
6. Step 6: Final answer
   x = 11,579,592.59