Finding the Fourth Proportional to 78.83, 108.79 and 51.22

Step by Step Solution

1. Step 1: Write the proportion equation
   78.83 : 108.79 = 51.22 : x
2. Step 2: Convert to fraction form
   78.83/108.79 = 51.22/x
3. Step 3: Cross multiply
   78.83x = 108.79 × 51.22
4. Step 4: Simplify right side
   78.83x = 5,572.22
5. Step 5: Solve for x
   x = 5,572.22/78.83
6. Step 6: Final answer
   x = 70.69