Finding the Third Proportional to 5,578,659 and 8,620,449

Step by Step Solution

1. Step 1: Write the proportion equation
   5,578,659 : 8,620,449 = 8,620,449 : x
2. Step 2: Convert to fraction form
   5,578,659/8,620,449 = 8,620,449/x
3. Step 3: Cross multiply
   5,578,659x = 8,620,449 × 8,620,449
4. Step 4: Simplify right side
   5,578,659x = 74,312,140,961,601
5. Step 5: Solve for x
   x = 74,312,140,961,601/5,578,659
6. Step 6: Final answer
   x = 13,320,789.27