Finding the Third Proportional to 187,788 and 391,108

Step by Step Solution

1. Step 1: Write the proportion equation
   187,788 : 391,108 = 391,108 : x
2. Step 2: Convert to fraction form
   187,788/391,108 = 391,108/x
3. Step 3: Cross multiply
   187,788x = 391,108 × 391,108
4. Step 4: Simplify right side
   187,788x = 152,965,467,664
5. Step 5: Solve for x
   x = 152,965,467,664/187,788
6. Step 6: Final answer
   x = 814,564.66