Finding the Third Proportional to 1,987,780 and 4,290,296

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987,780 : 4,290,296 = 4,290,296 : x
2. Step 2: Convert to fraction form
   1,987,780/4,290,296 = 4,290,296/x
3. Step 3: Cross multiply
   1,987,780x = 4,290,296 × 4,290,296
4. Step 4: Simplify right side
   1,987,780x = 18,406,639,767,616
5. Step 5: Solve for x
   x = 18,406,639,767,616/1,987,780
6. Step 6: Final answer
   x = 9,259,897.86