Finding the Fourth Proportional to 71.82, 99.17 and 53.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71.82 : 99.17 = 53.42 : x
2. Step 2: Convert to fraction form
   71.82/99.17 = 53.42/x
3. Step 3: Cross multiply
   71.82x = 99.17 × 53.42
4. Step 4: Simplify right side
   71.82x = 5,296.90
5. Step 5: Solve for x
   x = 5,296.90/71.82
6. Step 6: Final answer
   x = 73.75