Finding the Fourth Proportional to 128.46, 192.69 and 56.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128.46 : 192.69 = 56.37 : x
2. Step 2: Convert to fraction form
   128.46/192.69 = 56.37/x
3. Step 3: Cross multiply
   128.46x = 192.69 × 56.37
4. Step 4: Simplify right side
   128.46x = 10,861.94
5. Step 5: Solve for x
   x = 10,861.94/128.46
6. Step 6: Final answer
   x = 84.56