Finding the Fourth Proportional to 124.67, 172.06 and 72.23

Step by Step Solution

1. Step 1: Write the proportion equation
   124.67 : 172.06 = 72.23 : x
2. Step 2: Convert to fraction form
   124.67/172.06 = 72.23/x
3. Step 3: Cross multiply
   124.67x = 172.06 × 72.23
4. Step 4: Simplify right side
   124.67x = 12,427.89
5. Step 5: Solve for x
   x = 12,427.89/124.67
6. Step 6: Final answer
   x = 99.69