Finding the Third Proportional to 1,278,810 and 1,909,440

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278,810 : 1,909,440 = 1,909,440 : x
2. Step 2: Convert to fraction form
   1,278,810/1,909,440 = 1,909,440/x
3. Step 3: Cross multiply
   1,278,810x = 1,909,440 × 1,909,440
4. Step 4: Simplify right side
   1,278,810x = 3,645,961,113,600
5. Step 5: Solve for x
   x = 3,645,961,113,600/1,278,810
6. Step 6: Final answer
   x = 2,851,057.71