Finding the Fourth Proportional to 104.72, 144.17 and 99.59

Step by Step Solution

1. Step 1: Write the proportion equation
   104.72 : 144.17 = 99.59 : x
2. Step 2: Convert to fraction form
   104.72/144.17 = 99.59/x
3. Step 3: Cross multiply
   104.72x = 144.17 × 99.59
4. Step 4: Simplify right side
   104.72x = 14,357.89
5. Step 5: Solve for x
   x = 14,357.89/104.72
6. Step 6: Final answer
   x = 137.11