Finding the Third Proportional to 1,278,788 and 1,909,407

Step by Step Solution

1. Step 1: Write the proportion equation
   1,278,788 : 1,909,407 = 1,909,407 : x
2. Step 2: Convert to fraction form
   1,278,788/1,909,407 = 1,909,407/x
3. Step 3: Cross multiply
   1,278,788x = 1,909,407 × 1,909,407
4. Step 4: Simplify right side
   1,278,788x = 3,645,835,091,649
5. Step 5: Solve for x
   x = 3,645,835,091,649/1,278,788
6. Step 6: Final answer
   x = 2,851,008.21