Finding the Fourth Proportional to 124.34, 171.58 and 71.89

Step by Step Solution

1. Step 1: Write the proportion equation
   124.34 : 171.58 = 71.89 : x
2. Step 2: Convert to fraction form
   124.34/171.58 = 71.89/x
3. Step 3: Cross multiply
   124.34x = 171.58 × 71.89
4. Step 4: Simplify right side
   124.34x = 12,334.89
5. Step 5: Solve for x
   x = 12,334.89/124.34
6. Step 6: Final answer
   x = 99.20