Finding the Fourth Proportional to 128.72, 192.16 and 124.22

Step by Step Solution

1. Step 1: Write the proportion equation
   128.72 : 192.16 = 124.22 : x
2. Step 2: Convert to fraction form
   128.72/192.16 = 124.22/x
3. Step 3: Cross multiply
   128.72x = 192.16 × 124.22
4. Step 4: Simplify right side
   128.72x = 23,870.12
5. Step 5: Solve for x
   x = 23,870.12/128.72
6. Step 6: Final answer
   x = 185.44