Finding the Third Proportional to 356,400 and 781,488

Step by Step Solution

1. Step 1: Write the proportion equation
   356,400 : 781,488 = 781,488 : x
2. Step 2: Convert to fraction form
   356,400/781,488 = 781,488/x
3. Step 3: Cross multiply
   356,400x = 781,488 × 781,488
4. Step 4: Simplify right side
   356,400x = 610,723,494,144
5. Step 5: Solve for x
   x = 610,723,494,144/356,400
6. Step 6: Final answer
   x = 1,713,590.05