Finding the Fourth Proportional to 78.93, 108.93 and 49.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78.93 : 108.93 = 49.89 : x
2. Step 2: Convert to fraction form
   78.93/108.93 = 49.89/x
3. Step 3: Cross multiply
   78.93x = 108.93 × 49.89
4. Step 4: Simplify right side
   78.93x = 5,434.52
5. Step 5: Solve for x
   x = 5,434.52/78.93
6. Step 6: Final answer
   x = 68.85