Finding the Fourth Proportional to 127.93, 176.56 and 78.81

Step by Step Solution

1. Step 1: Write the proportion equation
   127.93 : 176.56 = 78.81 : x
2. Step 2: Convert to fraction form
   127.93/176.56 = 78.81/x
3. Step 3: Cross multiply
   127.93x = 176.56 × 78.81
4. Step 4: Simplify right side
   127.93x = 13,914.69
5. Step 5: Solve for x
   x = 13,914.69/127.93
6. Step 6: Final answer
   x = 108.77