Finding the Fourth Proportional to 78.99, 109.07 and 54.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78.99 : 109.07 = 54.50 : x
2. Step 2: Convert to fraction form
   78.99/109.07 = 54.50/x
3. Step 3: Cross multiply
   78.99x = 109.07 × 54.50
4. Step 4: Simplify right side
   78.99x = 5,943.50
5. Step 5: Solve for x
   x = 5,943.50/78.99
6. Step 6: Final answer
   x = 75.24