Finding the Third Proportional to 1,240,840 and 1,990,836

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240,840 : 1,990,836 = 1,990,836 : x
2. Step 2: Convert to fraction form
   1,240,840/1,990,836 = 1,990,836/x
3. Step 3: Cross multiply
   1,240,840x = 1,990,836 × 1,990,836
4. Step 4: Simplify right side
   1,240,840x = 3,963,427,978,896
5. Step 5: Solve for x
   x = 3,963,427,978,896/1,240,840
6. Step 6: Final answer
   x = 3,194,149.11