Finding the Fourth Proportional to 78.96, 108.96 and 51.32

Step by Step Solution

1. Step 1: Write the proportion equation
   78.96 : 108.96 = 51.32 : x
2. Step 2: Convert to fraction form
   78.96/108.96 = 51.32/x
3. Step 3: Cross multiply
   78.96x = 108.96 × 51.32
4. Step 4: Simplify right side
   78.96x = 5,591.83
5. Step 5: Solve for x
   x = 5,591.83/78.96
6. Step 6: Final answer
   x = 70.82