Finding the Third Proportional to 89,987 and 137,708

Step by Step Solution

1. Step 1: Write the proportion equation
   89,987 : 137,708 = 137,708 : x
2. Step 2: Convert to fraction form
   89,987/137,708 = 137,708/x
3. Step 3: Cross multiply
   89,987x = 137,708 × 137,708
4. Step 4: Simplify right side
   89,987x = 18,963,493,264
5. Step 5: Solve for x
   x = 18,963,493,264/89,987
6. Step 6: Final answer
   x = 210,735.92