Finding the Fourth Proportional to 78.35, 108.05 and 50.67

Step by Step Solution

1. Step 1: Write the proportion equation
   78.35 : 108.05 = 50.67 : x
2. Step 2: Convert to fraction form
   78.35/108.05 = 50.67/x
3. Step 3: Cross multiply
   78.35x = 108.05 × 50.67
4. Step 4: Simplify right side
   78.35x = 5,474.89
5. Step 5: Solve for x
   x = 5,474.89/78.35
6. Step 6: Final answer
   x = 69.88