Finding the Third Proportional to 990,492 and 2,138,616

Step by Step Solution

1. Step 1: Write the proportion equation
   990,492 : 2,138,616 = 2,138,616 : x
2. Step 2: Convert to fraction form
   990,492/2,138,616 = 2,138,616/x
3. Step 3: Cross multiply
   990,492x = 2,138,616 × 2,138,616
4. Step 4: Simplify right side
   990,492x = 4,573,678,395,456
5. Step 5: Solve for x
   x = 4,573,678,395,456/990,492
6. Step 6: Final answer
   x = 4,617,582.37