Finding the Fourth Proportional to 71.98, 99.32 and 53.57

Step by Step Solution

1. Step 1: Write the proportion equation
   71.98 : 99.32 = 53.57 : x
2. Step 2: Convert to fraction form
   71.98/99.32 = 53.57/x
3. Step 3: Cross multiply
   71.98x = 99.32 × 53.57
4. Step 4: Simplify right side
   71.98x = 5,320.57
5. Step 5: Solve for x
   x = 5,320.57/71.98
6. Step 6: Final answer
   x = 73.92