Finding the Third Proportional to 1,218,398 and 2,640,186

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,398 : 2,640,186 = 2,640,186 : x
2. Step 2: Convert to fraction form
   1,218,398/2,640,186 = 2,640,186/x
3. Step 3: Cross multiply
   1,218,398x = 2,640,186 × 2,640,186
4. Step 4: Simplify right side
   1,218,398x = 6,970,582,114,596
5. Step 5: Solve for x
   x = 6,970,582,114,596/1,218,398
6. Step 6: Final answer
   x = 5,721,104.36