Finding the Fourth Proportional to 78.82, 118.46 and 47.99

Step by Step Solution

1. Step 1: Write the proportion equation
   78.82 : 118.46 = 47.99 : x
2. Step 2: Convert to fraction form
   78.82/118.46 = 47.99/x
3. Step 3: Cross multiply
   78.82x = 118.46 × 47.99
4. Step 4: Simplify right side
   78.82x = 5,685.31
5. Step 5: Solve for x
   x = 5,685.31/78.82
6. Step 6: Final answer
   x = 72.13