Finding the Fourth Proportional to 71.52, 98.72 and 55.12

Step by Step Solution

1. Step 1: Write the proportion equation
   71.52 : 98.72 = 55.12 : x
2. Step 2: Convert to fraction form
   71.52/98.72 = 55.12/x
3. Step 3: Cross multiply
   71.52x = 98.72 × 55.12
4. Step 4: Simplify right side
   71.52x = 5,441.17
5. Step 5: Solve for x
   x = 5,441.17/71.52
6. Step 6: Final answer
   x = 76.08