Finding the Third Proportional to 56,991 and 123,642

Step by Step Solution

1. Step 1: Write the proportion equation
   56,991 : 123,642 = 123,642 : x
2. Step 2: Convert to fraction form
   56,991/123,642 = 123,642/x
3. Step 3: Cross multiply
   56,991x = 123,642 × 123,642
4. Step 4: Simplify right side
   56,991x = 15,287,344,164
5. Step 5: Solve for x
   x = 15,287,344,164/56,991
6. Step 6: Final answer
   x = 268,241.37