Finding the Third Proportional to 57,686 and 123,990

Step by Step Solution

1. Step 1: Write the proportion equation
   57,686 : 123,990 = 123,990 : x
2. Step 2: Convert to fraction form
   57,686/123,990 = 123,990/x
3. Step 3: Cross multiply
   57,686x = 123,990 × 123,990
4. Step 4: Simplify right side
   57,686x = 15,373,520,100
5. Step 5: Solve for x
   x = 15,373,520,100/57,686
6. Step 6: Final answer
   x = 266,503.49