Finding the Third Proportional to 3,578,862 and 5,420,415

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578,862 : 5,420,415 = 5,420,415 : x
2. Step 2: Convert to fraction form
   3,578,862/5,420,415 = 5,420,415/x
3. Step 3: Cross multiply
   3,578,862x = 5,420,415 × 5,420,415
4. Step 4: Simplify right side
   3,578,862x = 29,380,898,772,225
5. Step 5: Solve for x
   x = 29,380,898,772,225/3,578,862
6. Step 6: Final answer
   x = 8,209,564.60