Finding the Fourth Proportional to 78.37, 107.98 and 53.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78.37 : 107.98 = 53.76 : x
2. Step 2: Convert to fraction form
   78.37/107.98 = 53.76/x
3. Step 3: Cross multiply
   78.37x = 107.98 × 53.76
4. Step 4: Simplify right side
   78.37x = 5,805.58
5. Step 5: Solve for x
   x = 5,805.58/78.37
6. Step 6: Final answer
   x = 74.08