Finding the Third Proportional to 78.38 and 117.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78.38 : 117.56 = 117.56 : x
2. Step 2: Convert to fraction form
   78.38/117.56 = 117.56/x
3. Step 3: Cross multiply
   78.38x = 117.56 × 117.56
4. Step 4: Simplify right side
   78.38x = 13,820.94
5. Step 5: Solve for x
   x = 13,820.94/78.38
6. Step 6: Final answer
   x = 176.34