Finding the Fourth Proportional to 103.98, 143.63 and 71.37

Step by Step Solution

1. Step 1: Write the proportion equation
   103.98 : 143.63 = 71.37 : x
2. Step 2: Convert to fraction form
   103.98/143.63 = 71.37/x
3. Step 3: Cross multiply
   103.98x = 143.63 × 71.37
4. Step 4: Simplify right side
   103.98x = 10,250.87
5. Step 5: Solve for x
   x = 10,250.87/103.98
6. Step 6: Final answer
   x = 98.59