Finding the Fourth Proportional to 128.18, 192.23 and 56.02

Step by Step Solution

1. Step 1: Write the proportion equation
   128.18 : 192.23 = 56.02 : x
2. Step 2: Convert to fraction form
   128.18/192.23 = 56.02/x
3. Step 3: Cross multiply
   128.18x = 192.23 × 56.02
4. Step 4: Simplify right side
   128.18x = 10,768.72
5. Step 5: Solve for x
   x = 10,768.72/128.18
6. Step 6: Final answer
   x = 84.01