Finding the Third Proportional to 354,990 and 772,180

Step by Step Solution

1. Step 1: Write the proportion equation
   354,990 : 772,180 = 772,180 : x
2. Step 2: Convert to fraction form
   354,990/772,180 = 772,180/x
3. Step 3: Cross multiply
   354,990x = 772,180 × 772,180
4. Step 4: Simplify right side
   354,990x = 596,261,952,400
5. Step 5: Solve for x
   x = 596,261,952,400/354,990
6. Step 6: Final answer
   x = 1,679,658.45