Finding the Fourth Proportional to 76.55, 105.71 and 48.95

Step by Step Solution

1. Step 1: Write the proportion equation
   76.55 : 105.71 = 48.95 : x
2. Step 2: Convert to fraction form
   76.55/105.71 = 48.95/x
3. Step 3: Cross multiply
   76.55x = 105.71 × 48.95
4. Step 4: Simplify right side
   76.55x = 5,174.72
5. Step 5: Solve for x
   x = 5,174.72/76.55
6. Step 6: Final answer
   x = 67.60