Finding the Fourth Proportional to 127.98, 177.52 and 123.61

Step by Step Solution

1. Step 1: Write the proportion equation
   127.98 : 177.52 = 123.61 : x
2. Step 2: Convert to fraction form
   127.98/177.52 = 123.61/x
3. Step 3: Cross multiply
   127.98x = 177.52 × 123.61
4. Step 4: Simplify right side
   127.98x = 21,942.63
5. Step 5: Solve for x
   x = 21,942.63/127.98
6. Step 6: Final answer
   x = 171.45