Finding the Fourth Proportional to 127.10, 190.37 and 78.91

Step by Step Solution

1. Step 1: Write the proportion equation
   127.10 : 190.37 = 78.91 : x
2. Step 2: Convert to fraction form
   127.10/190.37 = 78.91/x
3. Step 3: Cross multiply
   127.10x = 190.37 × 78.91
4. Step 4: Simplify right side
   127.10x = 15,021.82
5. Step 5: Solve for x
   x = 15,021.82/127.10
6. Step 6: Final answer
   x = 118.19