Finding the Third Proportional to 1,287,403 and 1,891,690

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287,403 : 1,891,690 = 1,891,690 : x
2. Step 2: Convert to fraction form
   1,287,403/1,891,690 = 1,891,690/x
3. Step 3: Cross multiply
   1,287,403x = 1,891,690 × 1,891,690
4. Step 4: Simplify right side
   1,287,403x = 3,578,491,056,100
5. Step 5: Solve for x
   x = 3,578,491,056,100/1,287,403
6. Step 6: Final answer
   x = 2,779,619.95