Finding the Fourth Proportional to 128.52, 192.76 and 56.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128.52 : 192.76 = 56.37 : x
2. Step 2: Convert to fraction form
   128.52/192.76 = 56.37/x
3. Step 3: Cross multiply
   128.52x = 192.76 × 56.37
4. Step 4: Simplify right side
   128.52x = 10,865.88
5. Step 5: Solve for x
   x = 10,865.88/128.52
6. Step 6: Final answer
   x = 84.55