Finding the Fourth Proportional to 128.25, 192.38 and 52.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128.25 : 192.38 = 52.25 : x
2. Step 2: Convert to fraction form
   128.25/192.38 = 52.25/x
3. Step 3: Cross multiply
   128.25x = 192.38 × 52.25
4. Step 4: Simplify right side
   128.25x = 10,051.59
5. Step 5: Solve for x
   x = 10,051.59/128.25
6. Step 6: Final answer
   x = 78.38