Finding the Fourth Proportional to 124.34, 171.72 and 93.15

Step by Step Solution

1. Step 1: Write the proportion equation
   124.34 : 171.72 = 93.15 : x
2. Step 2: Convert to fraction form
   124.34/171.72 = 93.15/x
3. Step 3: Cross multiply
   124.34x = 171.72 × 93.15
4. Step 4: Simplify right side
   124.34x = 15,995.72
5. Step 5: Solve for x
   x = 15,995.72/124.34
6. Step 6: Final answer
   x = 128.65