Finding the Fourth Proportional to 72.41, 109.43 and 71.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.41 : 109.43 = 71.15 : x
2. Step 2: Convert to fraction form
   72.41/109.43 = 71.15/x
3. Step 3: Cross multiply
   72.41x = 109.43 × 71.15
4. Step 4: Simplify right side
   72.41x = 7,785.31
5. Step 5: Solve for x
   x = 7,785.31/72.41
6. Step 6: Final answer
   x = 107.52