Finding the Fourth Proportional to 128.85, 177.83 and 73.59

Step by Step Solution

1. Step 1: Write the proportion equation
   128.85 : 177.83 = 73.59 : x
2. Step 2: Convert to fraction form
   128.85/177.83 = 73.59/x
3. Step 3: Cross multiply
   128.85x = 177.83 × 73.59
4. Step 4: Simplify right side
   128.85x = 13,086.42
5. Step 5: Solve for x
   x = 13,086.42/128.85
6. Step 6: Final answer
   x = 101.56