Finding the Third Proportional to 1,218,430 and 2,640,242

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,430 : 2,640,242 = 2,640,242 : x
2. Step 2: Convert to fraction form
   1,218,430/2,640,242 = 2,640,242/x
3. Step 3: Cross multiply
   1,218,430x = 2,640,242 × 2,640,242
4. Step 4: Simplify right side
   1,218,430x = 6,970,877,818,564
5. Step 5: Solve for x
   x = 6,970,877,818,564/1,218,430
6. Step 6: Final answer
   x = 5,721,196.80