Finding the Third Proportional to 188,503 and 406,520

Step by Step Solution

1. Step 1: Write the proportion equation
   188,503 : 406,520 = 406,520 : x
2. Step 2: Convert to fraction form
   188,503/406,520 = 406,520/x
3. Step 3: Cross multiply
   188,503x = 406,520 × 406,520
4. Step 4: Simplify right side
   188,503x = 165,258,510,400
5. Step 5: Solve for x
   x = 165,258,510,400/188,503
6. Step 6: Final answer
   x = 876,689.02