Finding the Third Proportional to 89,040 and 136,920

Step by Step Solution

1. Step 1: Write the proportion equation
   89,040 : 136,920 = 136,920 : x
2. Step 2: Convert to fraction form
   89,040/136,920 = 136,920/x
3. Step 3: Cross multiply
   89,040x = 136,920 × 136,920
4. Step 4: Simplify right side
   89,040x = 18,747,086,400
5. Step 5: Solve for x
   x = 18,747,086,400/89,040
6. Step 6: Final answer
   x = 210,546.79