Finding the Fourth Proportional to 78.50, 108.24 and 50.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78.50 : 108.24 = 50.86 : x
2. Step 2: Convert to fraction form
   78.50/108.24 = 50.86/x
3. Step 3: Cross multiply
   78.50x = 108.24 × 50.86
4. Step 4: Simplify right side
   78.50x = 5,505.52
5. Step 5: Solve for x
   x = 5,505.52/78.50
6. Step 6: Final answer
   x = 70.13