Finding the Fourth Proportional to 78.24, 107.91 and 67.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78.24 : 107.91 = 67.98 : x
2. Step 2: Convert to fraction form
   78.24/107.91 = 67.98/x
3. Step 3: Cross multiply
   78.24x = 107.91 × 67.98
4. Step 4: Simplify right side
   78.24x = 7,335.72
5. Step 5: Solve for x
   x = 7,335.72/78.24
6. Step 6: Final answer
   x = 93.76