Finding the Fourth Proportional to 124.72, 172.10 and 72.25

Step by Step Solution

1. Step 1: Write the proportion equation
   124.72 : 172.10 = 72.25 : x
2. Step 2: Convert to fraction form
   124.72/172.10 = 72.25/x
3. Step 3: Cross multiply
   124.72x = 172.10 × 72.25
4. Step 4: Simplify right side
   124.72x = 12,433.43
5. Step 5: Solve for x
   x = 12,433.43/124.72
6. Step 6: Final answer
   x = 99.69