Finding the Fourth Proportional to 128.01, 191.98 and 36.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128.01 : 191.98 = 36.72 : x
2. Step 2: Convert to fraction form
   128.01/191.98 = 36.72/x
3. Step 3: Cross multiply
   128.01x = 191.98 × 36.72
4. Step 4: Simplify right side
   128.01x = 7,049.51
5. Step 5: Solve for x
   x = 7,049.51/128.01
6. Step 6: Final answer
   x = 55.07