Finding the Fourth Proportional to 78.82, 118.18 and 53.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78.82 : 118.18 = 53.12 : x
2. Step 2: Convert to fraction form
   78.82/118.18 = 53.12/x
3. Step 3: Cross multiply
   78.82x = 118.18 × 53.12
4. Step 4: Simplify right side
   78.82x = 6,277.72
5. Step 5: Solve for x
   x = 6,277.72/78.82
6. Step 6: Final answer
   x = 79.65