Finding the Third Proportional to 120.39 and 187.15

Step by Step Solution

1. Step 1: Write the proportion equation
   120.39 : 187.15 = 187.15 : x
2. Step 2: Convert to fraction form
   120.39/187.15 = 187.15/x
3. Step 3: Cross multiply
   120.39x = 187.15 × 187.15
4. Step 4: Simplify right side
   120.39x = 35,026.73
5. Step 5: Solve for x
   x = 35,026.73/120.39
6. Step 6: Final answer
   x = 290.94