Finding the Fourth Proportional to 78.37, 108.05 and 55.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78.37 : 108.05 = 55.09 : x
2. Step 2: Convert to fraction form
   78.37/108.05 = 55.09/x
3. Step 3: Cross multiply
   78.37x = 108.05 × 55.09
4. Step 4: Simplify right side
   78.37x = 5,952.04
5. Step 5: Solve for x
   x = 5,952.04/78.37
6. Step 6: Final answer
   x = 75.94