Finding the Fourth Proportional to 76.85, 105.71 and 67.47

Step by Step Solution

1. Step 1: Write the proportion equation
   76.85 : 105.71 = 67.47 : x
2. Step 2: Convert to fraction form
   76.85/105.71 = 67.47/x
3. Step 3: Cross multiply
   76.85x = 105.71 × 67.47
4. Step 4: Simplify right side
   76.85x = 7,131.89
5. Step 5: Solve for x
   x = 7,131.89/76.85
6. Step 6: Final answer
   x = 92.81