Finding the Fourth Proportional to 78.88, 118.18 and 46.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 118.18 = 46.80 : x
2. Step 2: Convert to fraction form
   78.88/118.18 = 46.80/x
3. Step 3: Cross multiply
   78.88x = 118.18 × 46.80
4. Step 4: Simplify right side
   78.88x = 5,530.82
5. Step 5: Solve for x
   x = 5,530.82/78.88
6. Step 6: Final answer
   x = 70.12