Finding the Third Proportional to 1,991,960 and 4,321,690

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991,960 : 4,321,690 = 4,321,690 : x
2. Step 2: Convert to fraction form
   1,991,960/4,321,690 = 4,321,690/x
3. Step 3: Cross multiply
   1,991,960x = 4,321,690 × 4,321,690
4. Step 4: Simplify right side
   1,991,960x = 18,677,004,456,100
5. Step 5: Solve for x
   x = 18,677,004,456,100/1,991,960
6. Step 6: Final answer
   x = 9,376,194.53