Finding the Fourth Proportional to 128.49, 192.72 and 37.18

Step by Step Solution

1. Step 1: Write the proportion equation
   128.49 : 192.72 = 37.18 : x
2. Step 2: Convert to fraction form
   128.49/192.72 = 37.18/x
3. Step 3: Cross multiply
   128.49x = 192.72 × 37.18
4. Step 4: Simplify right side
   128.49x = 7,165.33
5. Step 5: Solve for x
   x = 7,165.33/128.49
6. Step 6: Final answer
   x = 55.77