Finding the Fourth Proportional to 78.94, 108.91 and 54.01

Step by Step Solution

1. Step 1: Write the proportion equation
   78.94 : 108.91 = 54.01 : x
2. Step 2: Convert to fraction form
   78.94/108.91 = 54.01/x
3. Step 3: Cross multiply
   78.94x = 108.91 × 54.01
4. Step 4: Simplify right side
   78.94x = 5,882.23
5. Step 5: Solve for x
   x = 5,882.23/78.94
6. Step 6: Final answer
   x = 74.52