Finding the Third Proportional to 1,991,964 and 4,321,698

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991,964 : 4,321,698 = 4,321,698 : x
2. Step 2: Convert to fraction form
   1,991,964/4,321,698 = 4,321,698/x
3. Step 3: Cross multiply
   1,991,964x = 4,321,698 × 4,321,698
4. Step 4: Simplify right side
   1,991,964x = 18,677,073,603,204
5. Step 5: Solve for x
   x = 18,677,073,603,204/1,991,964
6. Step 6: Final answer
   x = 9,376,210.42