Finding the Fourth Proportional to 78.05, 107.72 and 48.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78.05 : 107.72 = 48.56 : x
2. Step 2: Convert to fraction form
   78.05/107.72 = 48.56/x
3. Step 3: Cross multiply
   78.05x = 107.72 × 48.56
4. Step 4: Simplify right side
   78.05x = 5,230.88
5. Step 5: Solve for x
   x = 5,230.88/78.05
6. Step 6: Final answer
   x = 67.02