Finding the Third Proportional to 1,218,392 and 2,640,174

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218,392 : 2,640,174 = 2,640,174 : x
2. Step 2: Convert to fraction form
   1,218,392/2,640,174 = 2,640,174/x
3. Step 3: Cross multiply
   1,218,392x = 2,640,174 × 2,640,174
4. Step 4: Simplify right side
   1,218,392x = 6,970,518,750,276
5. Step 5: Solve for x
   x = 6,970,518,750,276/1,218,392
6. Step 6: Final answer
   x = 5,721,080.53