Finding the Fourth Proportional to 103.38, 142.59 and 72.24

Step by Step Solution

1. Step 1: Write the proportion equation
   103.38 : 142.59 = 72.24 : x
2. Step 2: Convert to fraction form
   103.38/142.59 = 72.24/x
3. Step 3: Cross multiply
   103.38x = 142.59 × 72.24
4. Step 4: Simplify right side
   103.38x = 10,300.70
5. Step 5: Solve for x
   x = 10,300.70/103.38
6. Step 6: Final answer
   x = 99.64