Finding the Fourth Proportional to 104.63, 144.56 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   104.63 : 144.56 = 71.98 : x
2. Step 2: Convert to fraction form
   104.63/144.56 = 71.98/x
3. Step 3: Cross multiply
   104.63x = 144.56 × 71.98
4. Step 4: Simplify right side
   104.63x = 10,404.71
5. Step 5: Solve for x
   x = 10,404.71/104.63
6. Step 6: Final answer
   x = 99.44