Finding the Third Proportional to 1,209,136 and 2,639,320

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209,136 : 2,639,320 = 2,639,320 : x
2. Step 2: Convert to fraction form
   1,209,136/2,639,320 = 2,639,320/x
3. Step 3: Cross multiply
   1,209,136x = 2,639,320 × 2,639,320
4. Step 4: Simplify right side
   1,209,136x = 6,966,010,062,400
5. Step 5: Solve for x
   x = 6,966,010,062,400/1,209,136
6. Step 6: Final answer
   x = 5,761,146.85