Finding the Fourth Proportional to 71.99, 99.17 and 53.53

Step by Step Solution

1. Step 1: Write the proportion equation
   71.99 : 99.17 = 53.53 : x
2. Step 2: Convert to fraction form
   71.99/99.17 = 53.53/x
3. Step 3: Cross multiply
   71.99x = 99.17 × 53.53
4. Step 4: Simplify right side
   71.99x = 5,308.46
5. Step 5: Solve for x
   x = 5,308.46/71.99
6. Step 6: Final answer
   x = 73.74