Finding the Third Proportional to 578,990 and 1,275,776

Step by Step Solution

1. Step 1: Write the proportion equation
   578,990 : 1,275,776 = 1,275,776 : x
2. Step 2: Convert to fraction form
   578,990/1,275,776 = 1,275,776/x
3. Step 3: Cross multiply
   578,990x = 1,275,776 × 1,275,776
4. Step 4: Simplify right side
   578,990x = 1,627,604,402,176
5. Step 5: Solve for x
   x = 1,627,604,402,176/578,990
6. Step 6: Final answer
   x = 2,811,109.69