Finding the Fourth Proportional to 128.01, 191.82 and 73.89

Step by Step Solution

1. Step 1: Write the proportion equation
   128.01 : 191.82 = 73.89 : x
2. Step 2: Convert to fraction form
   128.01/191.82 = 73.89/x
3. Step 3: Cross multiply
   128.01x = 191.82 × 73.89
4. Step 4: Simplify right side
   128.01x = 14,173.58
5. Step 5: Solve for x
   x = 14,173.58/128.01
6. Step 6: Final answer
   x = 110.72