Finding the Fourth Proportional to 78.29, 107.98 and 55.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78.29 : 107.98 = 55.02 : x
2. Step 2: Convert to fraction form
   78.29/107.98 = 55.02/x
3. Step 3: Cross multiply
   78.29x = 107.98 × 55.02
4. Step 4: Simplify right side
   78.29x = 5,940.88
5. Step 5: Solve for x
   x = 5,940.88/78.29
6. Step 6: Final answer
   x = 75.88