Finding the Fourth Proportional to 127.39, 175.72 and 78.23

Step by Step Solution

1. Step 1: Write the proportion equation
   127.39 : 175.72 = 78.23 : x
2. Step 2: Convert to fraction form
   127.39/175.72 = 78.23/x
3. Step 3: Cross multiply
   127.39x = 175.72 × 78.23
4. Step 4: Simplify right side
   127.39x = 13,746.58
5. Step 5: Solve for x
   x = 13,746.58/127.39
6. Step 6: Final answer
   x = 107.91