Finding the Fourth Proportional to 78.82, 108.78 and 52.99

Step by Step Solution

1. Step 1: Write the proportion equation
   78.82 : 108.78 = 52.99 : x
2. Step 2: Convert to fraction form
   78.82/108.78 = 52.99/x
3. Step 3: Cross multiply
   78.82x = 108.78 × 52.99
4. Step 4: Simplify right side
   78.82x = 5,764.25
5. Step 5: Solve for x
   x = 5,764.25/78.82
6. Step 6: Final answer
   x = 73.13