Finding the Third Proportional to 1,278,718 and 1,909,323

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278,718 : 1,909,323 = 1,909,323 : x
2. Step 2: Convert to fraction form
   1,278,718/1,909,323 = 1,909,323/x
3. Step 3: Cross multiply
   1,278,718x = 1,909,323 × 1,909,323
4. Step 4: Simplify right side
   1,278,718x = 3,645,514,318,329
5. Step 5: Solve for x
   x = 3,645,514,318,329/1,278,718
6. Step 6: Final answer
   x = 2,850,913.43