Finding the Fourth Proportional to 128.48, 192.56 and 56.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128.48 : 192.56 = 56.25 : x
2. Step 2: Convert to fraction form
   128.48/192.56 = 56.25/x
3. Step 3: Cross multiply
   128.48x = 192.56 × 56.25
4. Step 4: Simplify right side
   128.48x = 10,831.22
5. Step 5: Solve for x
   x = 10,831.22/128.48
6. Step 6: Final answer
   x = 84.31