Finding the Third Proportional to 92.13 and 139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   92.13 : 139.38 = 139.38 : x
2. Step 2: Convert to fraction form
   92.13/139.38 = 139.38/x
3. Step 3: Cross multiply
   92.13x = 139.38 × 139.38
4. Step 4: Simplify right side
   92.13x = 19,425.39
5. Step 5: Solve for x
   x = 19,425.39/92.13
6. Step 6: Final answer
   x = 210.86