Finding the Third Proportional to 1,263,776 and 1,639,485

Step by Step Solution

1. Step 1: Write the proportion equation
   1,263,776 : 1,639,485 = 1,639,485 : x
2. Step 2: Convert to fraction form
   1,263,776/1,639,485 = 1,639,485/x
3. Step 3: Cross multiply
   1,263,776x = 1,639,485 × 1,639,485
4. Step 4: Simplify right side
   1,263,776x = 2,687,911,065,225
5. Step 5: Solve for x
   x = 2,687,911,065,225/1,263,776
6. Step 6: Final answer
   x = 2,126,888.84