Finding the Third Proportional to 1,239,623 and 1,915,499

Step by Step Solution

1. Step 1: Write the proportion equation
   1,239,623 : 1,915,499 = 1,915,499 : x
2. Step 2: Convert to fraction form
   1,239,623/1,915,499 = 1,915,499/x
3. Step 3: Cross multiply
   1,239,623x = 1,915,499 × 1,915,499
4. Step 4: Simplify right side
   1,239,623x = 3,669,136,419,001
5. Step 5: Solve for x
   x = 3,669,136,419,001/1,239,623
6. Step 6: Final answer
   x = 2,959,880.88