Finding the Third Proportional to 1,661,990 and 3,638,476

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661,990 : 3,638,476 = 3,638,476 : x
2. Step 2: Convert to fraction form
   1,661,990/3,638,476 = 3,638,476/x
3. Step 3: Cross multiply
   1,661,990x = 3,638,476 × 3,638,476
4. Step 4: Simplify right side
   1,661,990x = 13,238,507,602,576
5. Step 5: Solve for x
   x = 13,238,507,602,576/1,661,990
6. Step 6: Final answer
   x = 7,965,455.63