Finding the Fourth Proportional to 103.14, 142.38 and 72.09

Step by Step Solution

1. Step 1: Write the proportion equation
   103.14 : 142.38 = 72.09 : x
2. Step 2: Convert to fraction form
   103.14/142.38 = 72.09/x
3. Step 3: Cross multiply
   103.14x = 142.38 × 72.09
4. Step 4: Simplify right side
   103.14x = 10,264.17
5. Step 5: Solve for x
   x = 10,264.17/103.14
6. Step 6: Final answer
   x = 99.52