Finding the Fourth Proportional to 72.02, 107.53 and 71.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72.02 : 107.53 = 71.48 : x
2. Step 2: Convert to fraction form
   72.02/107.53 = 71.48/x
3. Step 3: Cross multiply
   72.02x = 107.53 × 71.48
4. Step 4: Simplify right side
   72.02x = 7,686.33
5. Step 5: Solve for x
   x = 7,686.33/72.02
6. Step 6: Final answer
   x = 106.72