Finding the Fourth Proportional to 76.98, 115.32 and 42.69

Step by Step Solution

1. Step 1: Write the proportion equation
   76.98 : 115.32 = 42.69 : x
2. Step 2: Convert to fraction form
   76.98/115.32 = 42.69/x
3. Step 3: Cross multiply
   76.98x = 115.32 × 42.69
4. Step 4: Simplify right side
   76.98x = 4,923.60
5. Step 5: Solve for x
   x = 4,923.60/76.98
6. Step 6: Final answer
   x = 63.96