Finding the Fourth Proportional to 124.50, 171.82 and 72.76

Step by Step Solution

1. Step 1: Write the proportion equation
   124.50 : 171.82 = 72.76 : x
2. Step 2: Convert to fraction form
   124.50/171.82 = 72.76/x
3. Step 3: Cross multiply
   124.50x = 171.82 × 72.76
4. Step 4: Simplify right side
   124.50x = 12,501.62
5. Step 5: Solve for x
   x = 12,501.62/124.50
6. Step 6: Final answer
   x = 100.41