Finding the Third Proportional to 1,240,830 and 1,990,821

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240,830 : 1,990,821 = 1,990,821 : x
2. Step 2: Convert to fraction form
   1,240,830/1,990,821 = 1,990,821/x
3. Step 3: Cross multiply
   1,240,830x = 1,990,821 × 1,990,821
4. Step 4: Simplify right side
   1,240,830x = 3,963,368,254,041
5. Step 5: Solve for x
   x = 3,963,368,254,041/1,240,830
6. Step 6: Final answer
   x = 3,194,126.72