Finding the Fourth Proportional to 78.85, 108.78 and 46.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78.85 : 108.78 = 46.09 : x
2. Step 2: Convert to fraction form
   78.85/108.78 = 46.09/x
3. Step 3: Cross multiply
   78.85x = 108.78 × 46.09
4. Step 4: Simplify right side
   78.85x = 5,013.67
5. Step 5: Solve for x
   x = 5,013.67/78.85
6. Step 6: Final answer
   x = 63.58