Finding the Third Proportional to 56,689 and 123,739

Step by Step Solution

1. Step 1: Write the proportion equation
   56,689 : 123,739 = 123,739 : x
2. Step 2: Convert to fraction form
   56,689/123,739 = 123,739/x
3. Step 3: Cross multiply
   56,689x = 123,739 × 123,739
4. Step 4: Simplify right side
   56,689x = 15,311,340,121
5. Step 5: Solve for x
   x = 15,311,340,121/56,689
6. Step 6: Final answer
   x = 270,093.67