Finding the Third Proportional to 89,080 and 136,980

Step by Step Solution

1. Step 1: Write the proportion equation
   89,080 : 136,980 = 136,980 : x
2. Step 2: Convert to fraction form
   89,080/136,980 = 136,980/x
3. Step 3: Cross multiply
   89,080x = 136,980 × 136,980
4. Step 4: Simplify right side
   89,080x = 18,763,520,400
5. Step 5: Solve for x
   x = 18,763,520,400/89,080
6. Step 6: Final answer
   x = 210,636.74