Finding the Fourth Proportional to 103.47, 142.72 and 72.48

Step by Step Solution

1. Step 1: Write the proportion equation
   103.47 : 142.72 = 72.48 : x
2. Step 2: Convert to fraction form
   103.47/142.72 = 72.48/x
3. Step 3: Cross multiply
   103.47x = 142.72 × 72.48
4. Step 4: Simplify right side
   103.47x = 10,344.35
5. Step 5: Solve for x
   x = 10,344.35/103.47
6. Step 6: Final answer
   x = 99.97