Finding the Fourth Proportional to 71.57, 98.72 and 55.01

Step by Step Solution

1. Step 1: Write the proportion equation
   71.57 : 98.72 = 55.01 : x
2. Step 2: Convert to fraction form
   71.57/98.72 = 55.01/x
3. Step 3: Cross multiply
   71.57x = 98.72 × 55.01
4. Step 4: Simplify right side
   71.57x = 5,430.59
5. Step 5: Solve for x
   x = 5,430.59/71.57
6. Step 6: Final answer
   x = 75.88