Finding the Third Proportional to 4,189,278 and 6,405,660

Step by Step Solution

1. Step 1: Write the proportion equation
   4,189,278 : 6,405,660 = 6,405,660 : x
2. Step 2: Convert to fraction form
   4,189,278/6,405,660 = 6,405,660/x
3. Step 3: Cross multiply
   4,189,278x = 6,405,660 × 6,405,660
4. Step 4: Simplify right side
   4,189,278x = 41,032,480,035,600
5. Step 5: Solve for x
   x = 41,032,480,035,600/4,189,278
6. Step 6: Final answer
   x = 9,794,642.43