Finding the Third Proportional to 89,988 and 139,698

Step by Step Solution

1. Step 1: Write the proportion equation
   89,988 : 139,698 = 139,698 : x
2. Step 2: Convert to fraction form
   89,988/139,698 = 139,698/x
3. Step 3: Cross multiply
   89,988x = 139,698 × 139,698
4. Step 4: Simplify right side
   89,988x = 19,515,531,204
5. Step 5: Solve for x
   x = 19,515,531,204/89,988
6. Step 6: Final answer
   x = 216,868.15