Finding the Third Proportional to 188,140 and 391,616

Step by Step Solution

1. Step 1: Write the proportion equation
   188,140 : 391,616 = 391,616 : x
2. Step 2: Convert to fraction form
   188,140/391,616 = 391,616/x
3. Step 3: Cross multiply
   188,140x = 391,616 × 391,616
4. Step 4: Simplify right side
   188,140x = 153,363,091,456
5. Step 5: Solve for x
   x = 153,363,091,456/188,140
6. Step 6: Final answer
   x = 815,154.10