Finding the Third Proportional to 187,742 and 391,018

Step by Step Solution

1. Step 1: Write the proportion equation
   187,742 : 391,018 = 391,018 : x
2. Step 2: Convert to fraction form
   187,742/391,018 = 391,018/x
3. Step 3: Cross multiply
   187,742x = 391,018 × 391,018
4. Step 4: Simplify right side
   187,742x = 152,895,076,324
5. Step 5: Solve for x
   x = 152,895,076,324/187,742
6. Step 6: Final answer
   x = 814,389.30