Finding the Fourth Proportional to 103.07, 142.17 and 71.98

Step by Step Solution

1. Step 1: Write the proportion equation
   103.07 : 142.17 = 71.98 : x
2. Step 2: Convert to fraction form
   103.07/142.17 = 71.98/x
3. Step 3: Cross multiply
   103.07x = 142.17 × 71.98
4. Step 4: Simplify right side
   103.07x = 10,233.40
5. Step 5: Solve for x
   x = 10,233.40/103.07
6. Step 6: Final answer
   x = 99.29